It's very obvious that a large amount of the burials within the Lombard cemetery at Collegno are Italians who were adopted into the ethnically distinct and Northern European like Lombard families as opposed to actual migrants from outside of Italy. The fact that we see so many in the very first generation Lombard burials (550-600AD) is strongly implicative of the fact that the Lombards did not maintain an ethnically homogenous ruling class, nor were they numerous enough to at all displace the local population. The non lombard associated burials of Bardonecchia and Torino (550-650AD) which appear filled with Northern Italians, yet, with the exception of as single french like individual, lacking northern europeans, serve as even stronger evidence that Germanic migrations did not impact the broader native populace.
In ethnic/geneaological terms a great sum of individuals buried in this Lombard specific cemetery are not ethnic Lombards at all - particularly those clustering with modern Spanish and Italian norms.