Well, here's the problem. I understand that an ACL surgery by itself is not that big of a deal, but after what he already went through it makes it a different situation. Just to help you understand, here are some pictures:
WARNING: Pictures are graphic!! 
It actually got worse after these pictures and all of the bones except for one fell out. He is left with the equivilant of a pinky toe. The middle two toes on a dog's foot bear the majority of the weight. Because he lost all but his "pinky" toe, he can't bear any weight on it and it is more for balancing. Because of this, even though he has all 4 legs he is more like a dog that only has 3.
Second, you all say it is only a matter of weeks, not months, but 12 weeks is 3 months. If his other one goes out then that is 6 months.
Third, most people here it seems had the surgery when they were 1, 2, or 3 yrs old. Kona will be 6 at the begining of the year.
Fourth, we have a 1.5 yr old English Mastiff and the two dogs LOVE to play with each other. We would pretty much have to keep Kona crated until he was completely healed because otherwise they would end up playing and hurting Kona all over again.
Then not to mention, considering we got Kona from a backyard breeder and he is already getting stiff and soar if he plays a lot. More than likely he will develop hip displaysia and/or arthritis.
On top of all this, the vets still don't know why his paw is sore and swollen on the the leg that has the ACL tear. We think the same infection he had before is back.