If we had a team with all the players at the level of Sanchez in terms of ability and winning mentality we would win the PL.
If we had a team full of weak players, physically and mentally, and lacking in world class talent like Walcott, Ramsey, Chamberlain, Giroud and Iwobi we would be just above mid table.
As for Ozil, I would admit he has been poor in recent games but I can only imagine his, as well as Sanchez, frustration at having to play with so many average players and a manager that doesn't seem to know what is going on, too much.
If we lose both Ozil and Sanchez, what kind of message does that send out?
What big clubs in Europe sells their only world class players?
We need to buy more, not sell the ones we have.