PSG don't need a striker, they've already spent a lot of money and they have good strikers, PSG just need to improve in defense, they're doing very well in attack and I doubt they'll want cristiano ronaldo and even if they wanted it it wouldn't bring an advantage to cristiano ronaldo, because as you said, cristiano ronaldo going to PSG would have to stay on the bench, it makes no sense to go to PSG
Ronaldo to PSG will apparently be more wage load for PSG considering how many of those players they have on there bench. PSG should rather concentrate on there Mildfield because to me they lack a quality No 10 although they have many DM's
About his comeback in Barcelona this is also not going to happen because Xavi also already stated he is happy about Messi who is doing good job for his current club PSG, so we have to wait for next announcement from player instead of going with this shit media.
Rumours will fling around since Messi is yet to sign new contract, Barca hierarchy are looking at the possibility of bring him back. For Man City it will be a good move for the club with Pep still in love with his playing pattern. But the most likely destination would be Inter Miami in MLS. All these depends on how the world Cup turns out he might even decide to go back to his boyhood club Boca Juniors to retire