Just to be clear, we're talking about the same Giannis who until this injury-filled postseason had only won a total of 3 playoff series in his 8-year career, right? The same Giannis who would have gone home in the 2nd round if Kyrie hadn't gotten hurt and still came a toe away from losing even WITH Kyrie hurt? The same Giannis who previously had been eliminated by the:
Rose-Butler Bulls
Lowry-Derozen Raptors
Tatum-Brown Celtics
Kawhi-Siakim Raptors
Butler-Bam Heat
That Giannis is suddenly a conqueror of worlds and would have racked up titles in the late 2000s even with a much shyttier supporting cast than he has now?
Bron averaged 40-8-8 against that Magic team and it still wasn't enough cause the Cavs didn't have the bodies to guard all the tall perimeter players. Putting Giannis in his place isn't gonna help them cause Dwight is gonna keep Giannis well under 40ppg and the Cavs still wouldn't have the bodies to guard all those perimeter players.
And the "old ass celtics" were 21, 32, 30, 31, and 23 in 2008 and 23, 34, 32, 33, and 25 in 2010. That ain't "old" enough to keep them from winning, that starting lineup had 8 more all-star appearances ahead of them in 2011-2013. Why would Giannis do any better against them than Bron? KG would have been a solid defender to match him and he ain't out there stopping Ray/PP on jump shots, in fact he'd have to choose between protecting the rim or getting pulled out by KG and either one is a worse option than Bron shutting down PP considering the parts of the court those Celtics made their shots from.