[quote=Archangel89]
Just a question...would it be uncommon for a drell vanguard to leave Kajhe and decide to merge himself with the asari culture
[/quote]

Well, considering that Drell are incredibly loyal to the Hanar for saving them.... 

But then again, has stated by our good friend Mass Effect Wiki 

[i] Those who leave Kahje tend to be adventurers. These solitary drell travelers often seek out new species elsewhere, and in turn adopt that species' culture. Such drell number in the thousands, and are scattered across the galaxy, tending towards quiet, integrated lives [/i]

So no, it won't be uncommon