Bill Gross last week abruptly left Newport Beach, California-based Pimco, the firm he built into a bond giant, to join Janus Capital Group (JNS.N), a small Denver firm that touts on its website how its friendly, team-oriented culture creates “strong collaborators.” While investors are certainly excited about the move – Janus shares are up 30 percent since the announcement – some wonder just how much easily the outspoken, 70-year-old Gross will fit in at the firm led by Pimco veteran Richard Weil.