I know but they never inspired much fear imo. They have dominated England at times but I was never nervous about the prospect of drawing them in the CL. The presence of Messi could be that final piece.
And I don't say this because of that Tweet above but, if Messi does leave, a reunion with Guardiola and a chance to take on the EPL is probably appealing to him.
Not to mention they can afford him considering FFP laws don't apply to them