In a 4-2-3-1 type formation him just working hard can be ok. Those front three have to do a lot of pressing and the full backs stay back a little more. But in a 3-4-3 i just don't see how he gets in the team for work-rate in a vital position behind the front man.
We all love a player that works hard. Of course. But in Certain positions. A Defender or a midfielder. But forwards are there to get goals. That is why we allow them to be a but more lazy on that front like Berba, or Ginola etc.
But having a hard working Forward who does not get goals or assists is basically having Soldado, Janssen etc in the team. And that is just not good enough. A forward player is just by how he affects the match with goals and assists. Not work-rate. Their are plenty of hard working forwards littered around the leagues. We need the extra quality around the box. A game changer, or a match winner. Not another hard worker. We have enough of them in the side.
You say his stock may be low. But in countries where a player has performed they usually are happy to buy him back. Like Woodgate, Owen etc. They are know to be good players and as long as their injury is not career threatening then they move.
Son is hit and miss but he causes problems for defences, he gets goals. he is a game winner on occasion. Name me one performance where has stood out as a game changing player. He has the technical ability, not the pace. And he cannot seem to bat a man with skill.
he was supposed to be our Bale type replacement. Not a forward version of Freund. For me he is not a starter. So we need to get in someone who can be. Like Mhirez or a Sanchez type player. Its one way we can improve this team.