I think Roch will go to finale and Rishabh might be evicted if it's between him & her. But if it's between him, Priya & Keith then Rishabh will be a finalist.
It's true that Rishabh has a large fanbase (he's pretty much ruling facebook. On twitter & insta Mandy, Rochelle & Prince are ruling) but compared to Rochelle he's still lacking behind voting wise & that's because Rochelle has a somewhat big fanbase + great PR team so she's one step ahead.