Mine would be Periera for his power and willingness to step up. Aspinall is also up there for his speed and versatility. DDP isn't that appealing style wise but i respect his well roundedness and willingness to improve.
DDP because of how unorthodox he is. But also because he is a striker who embraced the ground game from day one, and it´s what sets him apart from his peers. At least thus far it has.
Aspinal because he`s so well rounded, but his fights have been too one-sided, the heavyweight division is very poor.
Poatã. But I love Topuria. But my favorite is Jean Silva, this kid has impressive skills and demeanor, and I follow him since a while ago... this is a future champ.