Walker is first choice, and a world class one at that (who occasionally loses his head but still), he's 32 (still in his prime) come next season and has 2 years left on his contract
We don't need Porro next season, all the stars line up that 2023 we'd activate the buy back, Walker will have a year left to see out his career and pass over the torch and let him leave at 34
Because right now Walker is our #1 and he will play min 75% of games even if we bring Porro back this year, this way Porro gets a full season and develop his game
Think we can bring in Couto or Kabore to make up the games Walker doesn't play for next season
Also there is some questions that need to be asked about Porro in a back 4, as I'm pretty sure he plays RWB in a back 5 which, as we've seen with plenty of players, doesn't always translate to being great in a back 4