Oh most certainly it wouldn't be a comeback.Back when him and Claremont did their arc on JLA there was a little fanfare but nothing major about the two of them back together since Byrne left X-Men.

I think Marvel would certainly hype it a bit if Byrne came back to draw,say,Uncanny X-Men or FF but that's about it.

P.S.
Sprang did make a slight comeback in the 90's during a 3 issue arc of Detective Comics,where he did covers and interiors on parts of the story......'twas awesome. \:\)

It's a dog eat dog world & I'm wearing milkbone underwear.

I can get you a toe.

1,999,999+ points.

Damn you and your lemonade!!

Booooooooooooooobs.