Westmalle Bottles

well I was bottling up a batch of a belgian wheat beer I made, it was a bit of a noob/mongrel recipe that turned out not too great. Every so often though, one of the bottles would taste exceptional...it kept me drinking it , since i thought the bottle conditioning must be the cause. Well, the very last one I tried was really quite good, reminded me of a Dubbel, like a Westmalle and you know what? That last bottle was a Westmalle bottle. Maybe I didnt wash these good enough and some of their yeast survived the starsan bath? Is this a possibility? Would the bottling yeast that Westmalle uses be so good that it can make a sorta similiar grain bill taste like a westmalle?

Very unlikely. If you were that careless your bottles would most likely be infected by something other than left over Westmalle yeast.