To be honest, I have seen Bailly as CB next to Mussachio. How good is Bailly as RB? Is he better than Valencia? I hope he is good at crosses.
I can see Koulibaly coming to the premier league. He is a strong ball playing CB, I have been impressed with his technique and some long passes. He is around 1.95 m (6 ft 5 in), so that's also a plus. Unfortunately, he has been linked with Chelsea.
And what did you think of him as a CB?
I've only seen Bailly play twice, once against Real Madrid, and once against Barcelona. This is because I like to see Barcelona and Real Madrid play games where my preconceived conclusions give me the impression that the opposition won't yield to overwhelming superiority, but rather show conviction until the very end. From that small sample, Bailly played one of those (Real Madrid) games as a right back, and the other being against Barcelona as a CB. The latter was during the period where Barcelona weren't particularly impressive, even the game prior to that against Arsenal, I was deeply underwhelmed with their performance, despite them winning 3-1. As for the former, he had a great game against Real Madrid, playing as a right back. The reason I personally hope to see him play as a right back is ultimately derived from an abundance of reasons. For starters, his age. He turned 22 this year, whereas Koulibaly turns 25 this year, which would not only make the latter a similar age as Smalling, but most importantly from my perspective, he would be significantly older than TFM, Tuanzebe and Williams. Secondly, his weight. Eric Bailly at 77kg, is one thing I'm particularly disconcerted with considering it's been prevalent for us to get bullied by the sides at the lower sides of the table. Conversely, Koulibaly = 89KG. Thirdly, an interesting statistic I came across was that he was only dribbled past 6 times, compared to Smalling's 13 and Blind's 29. I can envisage him being like the way players bounce of Valencia, with perhaps the most notable example when we played Manchester City, and even from a Man Utd fan, it was embarrassing to see Sterling attempt to go past Valencia again and again and each time he would be comprehensively bullied. Additionally, I'm a big advocate of having an attacking full back on one side, and a defensively sound one on the opposite side, and given that Shaw is unequivocally our best full back, I'd like to see a defensively sound one on the left predominantly included in the starting berth, be that Darmian, Tyler Reid or Bailly. I'm quite fond of Valencia, but would rather see him playing as a right back, when we have a someone on the left that doesn't have the same exuberance as Shaw. That isn't to say he isn't or won't be a goof CB, I just personally hope he will be used as a right back.
Yes, Koulibaly is a commanding physical defender first and foremost, great ball retention, both footed, has just come off a season where he predominantly played on the left side of a central defence pairing, and he's quick also. He embodies the prototype of the perfect CB, if such a thing existed. The likes of Kompany at his peak, and the current Jerome Boateng would fit into this category, as they're physically imposing, quick, great readers of the game, yet, concurrently, being technically gifted on the ball. A partnership of Koulibaly as the LCB, and Boateng as the RCB would essentially be insurmountable imo.