Correct!
Yeah sorry not enough there to comment on for me, waaay too many variables. 6-12 months is a long time in recovery though, something is amiss here. Total replacement is usually about 9 months to getting back to a half way decent workout in the gym. The operation where they cut your biceps tendon off and drill a hole in your bone that they screw the biceps tendon to is only about 6 months. Those are both fairly major surgeries but that doesn't mean the recovery time is more or less for "simpler" surgeries.
I've had impingement syndrome, torn rotators, torn labrums, spurs, bones shaved down etc and nothing took more than around 3 months to be about 90%. Usually about a year later I will go 101% and bust something else, I think maybe subconsciously I feel a responsibility to make sure the surgeons make a good living.
TLDR? - I would want to know a fuck of a lot more if I were you guys before I made any kind of decision. I'd get a written description from the Dr of exactly what he intends to do and then find a top end physio and discuss the aftermath with them.
PS- those recovery periods I talk about above are based on my personal experience and that of acquaintances, I arent no Physician ....