The man has more reach, is 6'5", 230-240 lbs, is an excellent Muay Thai fighter, very strong and quick, and can take people down at all (Ala Hardonk, Evansan, Herring, Yvel). His chin ain't bad either. His GnP is brutal and has KO Power in his punches, knees, and kicks.
I don't think A.Silva could take him down if his life depended on it. Elite wrestlers like Cain did it and kept him there but A.Silva will just want to strike (obviously) like he does with everyone else. I think that would be a huge mistake against Kongo.
Plus this fight ain't going to Decision. Two excellent strikers with the intent to get the opponent out of there. It will be a KO of the Night.