I'm a big Latrell fan and would like him to stay but it was discussed amongst Roosters fan circles, forums like this and even the media that for the Roosters to keep key players we'd have to lose players.
In my mind I'd rather lose Latrell over Manu and I'd rather lose Tetevano over JWH. Nobody wants to see those players go but unfortunately it's a reality of the game. Wherever Latrell goes they'll have a gun centre/fullback/5/8 and the Panthers have already confirmed a great pick up in Zane Tetevano.
As you said, the Roosters will figure it out. Billy Smith made his debut last year at centre and was strong.If he's not ready we already know that Aubusson can fill in there until Smith or someone else is ready.
Even without Cronk, Latrell and Tetevano the 2020 Roosters side is a gun side that very well could go deep into the comp and potentially win it for the third time. Tedesco, Tupou, Manu, Keary, JWH, Friend, SST, Cordner, Crichton, Aubusson, Liu are all still on our books.