I think it would depend on what season Don you're using. first/second season Don was definitely very protective of his baby brother. I think he wasn't as over protective in the later seasons.

But it would still be fun to see Don Eppes fussing at Hotch and Rossi (or Hotch and Gideon?) or involving his baby brother.

And I love Edgerton. I liked the eppesode where Edgerton was reassuring Don about seeing a shrink. I'd imagine that as a sniper, Edgerton's probably required to see a shrink on a regular basis. After all, you don't want your sniper to burn out, or suffer a psychotic break.