Pereira has been tested enough in stand up and I think he is one of the best fighters in that area, but he needs more time to improve on ground.
Light Heavy weight is best UFC division for me at the moment, but I love to watch all heavyweight fights in MMA and boxing.
Prochazka, Rakic and Błachowicz are all-around good fighters both on ground and in stand up, and they are soon coming back from their injuries.
Expect the unexpected in this division

Alex won't be turning into a ground fighter, it's too late for him to adapt a completely new style, he'll stick to what he knows best and what has worked for him quite nicely. Obviously he is and will continue to train on his take down defence. And if he does that element well, don't expect to see him on the ground.
Light heavyweight is not bad, but to me, lightweight and middleweight are more interesting. Lightweight is packed with high-profile fighters and objectively generates more revenue than any other class.