"If he goes on to beat AJ, DW, and TF all by KO" Yes, Ruiz will be an ATG if he beats those 3 big name fighters. Why not?
Ruiz is a good fighter, but he has a long way to go before we can even consider him an ATG. An upset over a slightly overrated Joshua and the Parker robbery don’t cut it. If he beats Wilder, Fury, savages the contenders and stays atop the division for a decade, maybe just maybe, but right now no.