Chelsea fans have SO far been far from impressed by Lukaku and I would put their feelings in the same way as ours with Grealish.Lukaku has 3 goals in 7 PL games and overall 4 goals and 1 assist in 11 games so far. (the stats are about the games he played in so his injury is irrelevant)
Grealish has 2 goals and 3 assists in 14 games so far.
The stats are pretty similar even though Grealish is expected to create goals while Lukaku is expected to score them. You don't really see Chelsea fans out there saying Lukaku is a flop or that they shouldn't have paid so much for him.
The fee is an issue and could be a serious issue that has huge implications for us as a club.
Hypothetical....But IF he was to fail you are going to take an enormous hit on wages and value, that would have implications due to FFP on future dealings. Hypothetical and no slur on Grealish but just a fact that the higher the fee, the greater the risk. All transfers are risks but the higher the value the greater the risk.