Even if that was the case, Luiz could have stayed and tried to prove Lampard wrong for a place in the starting XI. Instead, he decided to jump ship immediately and jump ship to a direct rival at a shit timing!
Luiz going to Arsenal might come back to haunt us in the short term but long term wise, think we'll be fine. Much as I'm annoyed selling to a direct rival, Arsenal haven't solved their long standing issues in that defence. They have basically just put a band-aid over it.
The summer transfer window is gone, there's no compensation whatsoever. That's half of the ban served. If the appeal is successful, we can buy again in January. If not, then next summer.