Lewis is lighter now, he could be fast too. He suddenly jumped with his flight knee right from the beginning vs Marcos de Lima, definitely unpredictable, and with his size, he only needs one shot to KO Almeida. Surprisingly it's not easy to submit Derrick if you look at his records and they are fighting at 265lbs which Derrick is used to.
Because of that Almeida better be cautious before rushing out, he is fighting a big guy. A bit of 60/40 favoring Almeida by KO.
Anyone in the heavyweight only needs one shot to KO the opponent, but yeah, Lewis has a good record of 1st/2nd round KOs. I'm a bit surprised he's a big underdog in this fight, you can get x4.5 return for betting on Lewis. That being said, I'm not very familiar with Almeida, but his 19 wins and 2 losses look very impressive for a heavyweight.