He seems to have a good track record with replacing stars, so I'd say he probably knows what he's doing. Still plenty of time to sign players if he feels it's necessary.
He didn't sell Tevez, he offered him a contract that would've made him the third highest paid player at United and he couldn't accept having to fight week in week out for a starting role.
Do you like coke/hookers/cheating as much as your namesake?