Some people theorize that it was Michael Ciancaglini who was the real force behind the young guys and Merlino was basically his Gravano in some ways. I don't know how true that is but judging from the pictures Mikey Chang seems to be the more charismatic of the two, not just that but Joey's demeanor just looks like that of a #2 guy when photoed with Michael Ciancaglini. Sometimes you could tell a lot from a picture, but who really knows.