I think they'll port there older games like mario galaxy to xbox and Microsoft ports older AAA games like halo 3 but not halo 5 because it needs some serious hardware and a great online. while we might see indies on both sides being ported to each other? It's possible since those leakers said nothing instead of no? 

As much as I'd love to see the first Splatoon go on to other platforms, I doubt it would happen at all...

Nada. I don't know why people keep imagining this pipe dream but there's was no allusion of sorts. This was a one-way deal.

There was news on Gamexplain that said it was Microsoft who actually approached the Cuphead devs to port the game to the Switch.

Well I'm glad that new rumour mentions xbox gamepass is not coming to switch

Why would Nintendo port their games to Xbox?

Nintendo did make games for a rival console before called the panasonic cdi 

No.

they didnt. what games are you referring to?

I replied too fast I meant Nintendo let panasonic cdi console use Nintendo Ip which is like Nintendo letting there IP's on other consoles