Joe Jonas on Brother's and Sisters

The producers of Brothers and Sisters apparently believe that Joe Jonas looks like a younger Balthazar Getty because it appears that Joe will portray a younger version of Tommy Walker in an upcoming two-part episode flashback  that features the history of the Walker family.  Seems like Joe is branching out like little brother Nick.  What do you think about Joe being cast?  Could this be the beginning of the end of The Jonas Brothers?? Fingers crossed!!
Oh and just a little extra scoop.  Seems that Rachel Leigh Cook will portray a younger Sally Field, a.k.a Nora Walker!!