I also think same way. Bringing back Infernape means Ash will most likely going to rotate his team, which means he can increase his team by either bringing other reserves or catching new ones.
That's why I think Infernape possibly be just one episode thing (not a regular cast). For Gary, well maybe, the group is divided and Gary possibly with other group.
If Glalie does appear, then I hope Goh to catch it since this possibly makes it higher chance for Ash to catch Absol. Of course, Goh still possibly catch both of them.
I hope Ash to catch Psychic and Fairy type Pokemon. I know Ash has Mr. Mime, but it is mostly taking a role as housekeeper. So, I want Ash to have Psychic/Fairy type Pokemon which he can actually use it for battle.
I also want Ash to catch Marshtomp, but it kind of bugs me its appearing episode is only half-episode. So, it may become just recurring character and going to be capture later (like Gengar and Krookodile).