We have a habit of dismissing players for not scoring when we get 15% possession and one chance to put the ball in the net. Beto may fall into the waste of space category or the we aren't playing the best way to bring out his talent to fore. Probably more like a bit from A and a lot from B.
What I would definitely say we need to improve the squad and the way we play for the benefit of all. If we sell Beto to give funds to boost other areas it does not confirm his failing, it is just the quickest way to get from where we are now to were we would like to be. Which is to dominate the ball and thus give our attackers most chances possible within a game to stick the ball in the net.