He wouldn't get enough chances. Before Eto'o joined he hadn't even started a single game, and got cameos here and there. There's not many, if any, top clubs in Europe who have a 20 year old leading their line, experience is always valued, and moreso for a team like Chelsea who already have so many young midfielders, this is why/how Mourinho justifies playing Lampard behind them, and why i'm sure he got Eto'o in. About pressure, we have 2 strikers who know what its like to play in big games, who have scored goals in Euro finals to CL finals. Lukaku is still learning and his time will come, but i don't see him leading our line just yet.