Bailly-Rojo seems to be the best combo. Strong tackles, good marking, Bailly provides pace, Rojo do organize, both are good interceptor, can pass well from the back, good in one-on-one, aerial may be suspects but both are solid enough and Baily will improve, they inspire confidence since just them two defending is enough with everyone else focus attacking especially when we're chasing games. Both also plays a bit like sweepers, negating attacks smoothly. Best of all, both are the types of defenders that bully opposing attackers
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Smalling is solid, and imo our best defender when defending aerials duel and set-piece. He doesn't combine well with any CB partner though, perhaps due to lack of communication. Smalling is not communicative, plus Jones and him are prone to costly mistakes, thus he's reliable only in certain situations. At least he's more reliable than the defenders below. Doesn't inspire confidence except in set-piece. Solid strong defender, useful tactically, but could be costly.
Jones have unique capability I noticed, that is he could combine well with any defenders, but of course he won't bring the partnership to the greater level. He will do his defensive duties not spectacularly but efficient, but he's prone to mistakes and of course injuries, so not the best pairing partner we can rely on. I fear us conceding when he plays. Efficient defender with mistakes- and high injuries- proneness.
Blind. Skip. Well, he have a lot of good football qualities and have perform good in many matches as CB but worst in other matches leading to costly mistakes. I don't feel confident, neither does the team I'm sure. Better playing at Centre midfield, with LB alternative role. Good intelligent defender with good interceptions though, with occasional costly mistakes.
Tuanzebe have good potential, rated highly in youth level and the few clips showed that he's good at interceptions and clean tackling, sweeper type seemingly. However, he lacks the physical attributes of EPL defenders, but that could be easily trained so, he's promising, but lack experience. Will improve for sure.
TFM have the physicality already with good pace, but seems to lack self-control. Passion is good, but reckless tackles can be costly. The team doesn't need to reward costly freekicks to opponents especially when we're winning. So, he's risky and lacking exps, but he have good potential. I love his crunching tackles though, and he seems to be a player that likes to bully opponents with his strength and pace. Perhaps better playing in centre midfield or RB. Will improve for sure.