Michael and Sierra made a connection on Day 1 of Bachelor in Paradise and continued to deepen their bond, but Michael eventually determined something was missing between them and his grief was keeping him guarded. (Michael, a single father, lost his late wife Laura to breast cancer in 2019).
Michael asked Sierra to just be friends and so she chose to self-eliminate, which left Michael without a partner -- and seemingly a rose -- heading into the second Rose Ceremony of the season.
However, Bachelor in Paradise bartender Wells Adams appeared to orchestrate Danielle Maltby's entrance just in time to save Michael, and then Michael and the blonde neonatal nurse -- who lost her fiance Nick Haag to a drug overdose in 2011 -- were given a date in Paradise the very next day.
Michael revealed on the show that he and Danielle, whom he affectionately called "Dani" when they met on the beach, had spoken via DMs on Instagram and became friends prior to filming the show, which prompted Sierra to tweet, "He said 'a little bit of history.'"
Sierra, a Dallas-based yoga instructor, also posted an emoticon with a magnifying glass up to its eye at the end of her tweet.
Michael and Danielle went on to have a successful date sailing on a yacht and going out to lunch together. Michael said he felt understood and no longer alone since Danielle could relate to his past trauma and heartache.
With Danielle's help, Michael ultimately realized a piece of Laura would still exist within the love he could possibly share with The Bachelor 21 alum, and then the pair shared their first kiss.
Michael concluded how it was the greatest day ever, adding, "Maybe it's the last first date of my life."
But Sierra certainly wasn't thrilled with Monday night's episode. She also posted a video on Instagram and wrote, "Hmm. #bachelorinparadise #bachelornation."
In the video, Sierra was mouthing, "That's suspicious. That's weird," and she wrote on the footage, "When the math isn't mathing."
Comments from Bachelor in Paradise fans poured in, including ones encouraging producers to choose Sierra as the next The Bachelorette star and others slamming Michael and how he had treated Sierra in Paradise.
"Why is he acting like he didn't have a connection with you at all??? I'm #TeamSierra on this," one person wrote on Sierra's posting.
A second person wrote, "This man saying he wanted a miracle!!!!! Sir you had a miracle PLUS STARS."
And another fan commented, "Sir you had a shot at love with a beauty!! But see, what he actually meant was he wanted a blonde."
One of Sierra's followers complained, "He knew the blonde was coming," and a different Instagram user wrote, "He needs therapy. Not the bachelor franchise."
Wells, who is very good friends with Danielle, made it no mystery that producers brought the Bachelor in Paradise 4 alum on the show just for Michael.
Wells explained to cameras how Danielle is "the sweetest, nicest and funniest" woman he knows and she's also a neonatal nurse who would seemingly be perfect for Michael.
"They're the same person with different genitalia! They should be together!" Wells joked on Monday night's episode.
Wells also tweeted as the episode was airing how there was nothing low key about the fact he had played matchmaker on the beach.
"They cut it, but I told @MichaelAllio I had someone for him and then walked up the steps of paradise, welcomed @daniellemmaltby and told her to go find Michael. #BachelorInParadise @BachParadise," Wells revealed on Twitter.
Michael and Danielle's match had Bachelor Nation chatting up a storm on Monday night via social media, according to tweets gathered by Us Weekly.
Natasha Parker tweeted, "So they brought Danielle in to save Mike A, so he must have an official bach podcast coming out right !?"
Natasha was referring to backlash that some Bachelor in Paradise contestants get special treatment if they're going to be asked to host a Bachelor Nation podcast.
Marlena Wesh wrote, "So Michael didn't know this girl orrrr... cuz it's giving secret lover."
The Bachelor 25 bachelorette added, "Damn... Michael got the privilege edit #BachelorInParadise."
Hunter Haag playfully tweeted, "Where was my convenient 'here is a man to save you from leaving' right before the rose ceremony rose."