Udoka's guarding Kobe the same way Pop has Bruce guarding him - give him the jumper and prevent the penetration to the lane.
All Udoka is doing is buying time for Bruce to catch a breather, which is all anyone would do checking Kobe. Who do you suppose we should put on Kobe instead? Finley? Barry? Manu? Stoudemire?
The fact is there isn't anyone better or even comparable to Udoka defensively to put on Kobe, and any of the other guys we could trot out there Kobe WOULD be able to go around and create havoc in the paint.
In short, people need to stop ing about Ime on Kobe and just understand that's the way it's going to be when Bowen needs a breather and not much is going to change.