If Page is trained and focused, I could see him winning this on a late round stoppage or decision. But could Earnie land the big one and stop Greg?
If a well trained Shavers like the one between 1975 and 1979 shows up, he could very conceivably beat Page. Greg was tough when he was motivated and on top of his game, but he had just as many inconsistant nights in his career as Earnie did. In fact probably even more so. I pick Shavers by knockout, but say it with no real conviction. The same could go the other way.
Page on a good night would knock Earnie out. Many don't realise just how fast he was early on. Page has the sort of power that would stop Earnie, and he could do it from afar. If however he turns up fat and uninspired he'd better watch out.
The version of Page that stopped Stan Ward and Marty Monroe would stop Earnie late, too much skill and power, any other version would most likely get stopped, especially the Page that came in versus Chaplin 2 and Tillis.
I love Earnie, but I think Page had better stamina and chin. He'd probably stop Earnie between rounds 5 and 10.
Greg could take a good shot, and was a big strong guy. In decent condition [and with suitable caution], he should be able to produce a pretty conclusive outcome, either via comfortable decision or late round stoppage.