incoming byler theory, shoegate!!!
So we've seen Mike wearing Will's shoes in s5 for whatever reason.... but could it be symbolism?
in simple words, literally AND figuratively Mike is putting himself in Will's shoes. figuratively, because s5 Mike is going to experience what s4 Will went through. Their roles are going to be reversed.
the phrase "to put yourself in someone else's shoes" is to experience (or at least imagine) what they went/are going through.
firstly, s4 was strictly filmed from Will's pov, showing almost nothing from Mike's. this does make it feel as if mikes character arc has been left on a cliff hanger since the ending of s3, where we did get to see more into Mike's mind, and that spoke a lot to us.
so far, what we can confirm is that Will Byers is in love with Mike Wheeler, mostly from his pov being the main focus of the love triangle in s4. they made it clear for us. yet, Mike's perspective is still blurry.
thats the main reason why i think it would only make sense for s5 to show Mike's pov a LOT, and reveal some things that weren't necessarily obvious in s4 (for one, Mike's feelings for Will).
knowing we're finally going to be seeing Mike's pov, we'll see him pining over Will, just like Will did s4. they are going to switch their roles on screen, we'll see Mike, now that he doesn't have to deal with his relationship issues with El and his (not necessarily) new issue of how he doesn't think Will could ever love him back. and Will, is going to be trying to resolve issues with his connections to vecna.
my main point is, the writers are going to figuratively put Mike in wills shoes. Mike is going to be pining over Will this season, and it will be explicitly shown this time.
these are Mike and Will's shoes in s2. keep note of the designs and colors.
these are Mike's shoes in s5. coincidentally (not), they have the same design as his shoes in s2. but the colors seem to be the opposite?
now these are Will's shoes in s5. they too keep the same design as his own shoes in s2, and the colors are opposite, just like Mike's shoes.
or... the colors are reversed.
Mike and Will's shoes kept the same designs from s2, but the colors are reversed, just like their roles will be in s5.