Can she though? Without Maya, where is her story? And that's a genuine question by the way. She'd eventually come to B&R and Maya wouldn't be there to stop her getting with the main character, so she can happily get with Tremelo, (yeah there may be drama with Tommy) Maya wouldn't be there to have financial troubles (the current drive in the plot is gone), Maya wouldn't be there to go to Burke and potentially bring down the restaurant (another drive in the plot gone)... There's nothing much left there, Drama is gone.
While she may mirror Sage in the ways you said, which is kinda reaching at straws... Yes, they were cheated on by their partner and they went in a direction opposite to what their sexuality would suggest, both with a bloke. Sage actually left her partner, Josy forgave and forgot (and still didn't get over the MC) Josy definitely doesn't hate Tommy, at least not to the level Sage hates Tybalt. I will admit is definitely more one-sided with Tommy perhaps caring more. The not letting MC go I will grant, this shows quite a lot if MC rejects her. They both have their motives for helping Maya though and they very different. Jill even wants to help Maya. Well Josys parents may be divorced, Sage's Parents we know nothing about, and her adopted parents although now separating, were not at the start of this journey. Yes they may have a few characteristics that are similar, but I don't know what story can be told for Josy without Maya.