Any version of Tua beats Andy Ruiz. You need good footwork and defense to stand a chance against Tua. Andy Ruiz has sluggish feet and is too wiling to trade at mid range. He eats a left hook and takes a nap. Probably doesn't even last that long.
Andy Ruiz is faster, better on the counter and on the inside but I don't think he could hurt Tua or back him up and prime Tua the one that fought Ike would set a work rate that Ruiz simply couldn't live with. Even if iron chinned Ruiz could take the Tua left hook he'd eventually tire and be broken down and once he's vulnerable he'll have no way of fending off Tua who will then just go through him quicker than Ruiz does holiday candy.
LOL, no. Fat version of Tua loses to fat version of Ruiz (and any version of Ruiz is fat). Fat version of Tua was slow and lethargic and had awfully low workrate. OK, I can understand that kind of workrate against Lennox Lewis, but not against Hasim Rahman, who was in awful shape himself for rematch (257 lbs!!!) but still outboxed Tua easily. Much better and slimmer version of Rahman was battered by shot Holyfield in his previous fight
Prime Tua by skull explosion round five. Ruiz jr has a great chin that would spell disaster for him as Tua throws bombs with a high work rate. If Ike Ibeabuchi isn’t stopping or hurting Tua I fully expect Tua to waste a few rounds laughing at Ruiz Jr punches before murdering him.