Why would changing the object used have any effect on their power?
We saw this with Riruka, using different objects doesn't meaningfully change the power.
And a change of priorities wouldn't nessesarily change whether or not an object has sentimental value.
I can see the power changing, but it'd be far more likely that a realization of the change would simply trigger the fullbring to take on a new form.(Probably at a dramaticly apropriate moment.)
Also, someone needs to post something.