I check my tires for balance with every change (balancing stand) and usually the weights that are on the wheels have been fine. The couple that I needed to change it wasn't much of a change (same position, just a little more or little less weight).

 

You should have left the rotor on it for balancing. That's probably where your vibration is coming from. It's all part of the same rotating mass on the front of your bike.

 

He's not lucky, I've done the same thing many times. I think it has more to due with top shelf tires. Bargain tires not so much.
Remember..cheap is ...well, cheap.

 

Pretty hard to figure out the original question but it sounds like your dealer correctly did not balance the wheel assembly because they didn't have the brake rotor. If you had keyed the rotor and rim and put them back together in the same position it would have probably been fine. So now you need the wheel assembly balanced. So either bring the entire wheel assembly to the dealer (less expensive at an indie) or build a cheap home balancer.

Here's one I made out of two old jackstands and some $12 skateboard bearings . . .