Iceman can solo thanks to his ability to freeze close to and on absolute zero. No amount of Logia power can save them from absolute zero freezing, He managed to flash freeze a fusion core explosion. Busoshoku Haki wont affect him as his powers stem from mutation and not devil fruits which they are able to affect and bypass.
He has changed quite a bit but I was told he also has some form of energy manipulation and forcefield projection now, but dont hold me to that.
To sum up he can solo with ease. Aokiji is not even needed here.
@taichokage: The difference between Haki and telekenetic/kenesis is very different. Haki itself stems from one spirit, with training one can utilize it and form it into one of the 3 (2 if they are unable to use Haoshoku) Haki avaliable. Phychic abilitys are different in that they stem from the power of the mind and not the spirit. The Haki in question allows the wielder to bypass the effects of a devil fruits powers (Among other things), to strike the body directly, and depending on where the hit landed it would do damage to the body part that has been altered, Hit the heart and it destroys the heart. To do that it would have to neutralize the devil fruits effects on any part of the body that is cut for it to do damage, which is why they can still defend against it by hitting the attack away. There is nothing to suggest that Devil Fruit powers alter the body in the same way as the X gene does for Bobby, hence why I say Haki will most likely not affect Bobby in the slighest in the form of an attack.
But we are arguing over semantics lol. I like to think of him in this instance like the anti Zanka no Tachi, he will rapidly steal all the heat from around them and freeze them in place before they can fight back.