BA picked Terepo before Alvaro. He prefers to.
Whether that's true or not (and given Alvaro has started more games than Terepo in the last year or so, it's very debateable), Terepo is the one off contract, not Alvaro. Terepo makes less metres than Alvaro and doesn't run any harder. Defence is equal. Alvaro gets quicker play the balls and has better hands.
If we have signed Evans, why would we keep Terepo? It's not even a question of how good he is, it's a question of space.
Assuming he has signed with us, Mannah, Matagi, Alvaro, Vave, Evans, Brown, Scott are all on contract middle forwards. Based on our team make up so far, one has to miss out. Probably Alvaro or Vave. We have no need to keep Terepo, we can keep O'Brien for less money and re-sign Twal for less money....unless he settles for way less than someone like Newcastle or the Tigers can offer (and given his injury, he might) then he's probably gone. No matte how hard you overrate him, he is off contract and we have plenty of better players on contract.
Other sides can offer top 17 money. We can offer 6th choice prop money. Do the maths.