What to do with a five year old?

Oh, we are having a devil of a time trying to decide what we should do with Max this year for school.
He is growing up SO fast. For the past two years he has been a part of an "early intervention" type program run through the elementary school that has done him WONDERS.

His birthday is in September and he will turn 5.

When he started the program at age three he was just out of surgery , having been deaf until that point in his life. He was not speaking any words at all. In the initial speech assessment the speech therapist was setting goals with us and said for us not to set our hopes too high, and that if he managed by the end of the school year to have between three and five words that would be a success through their program.
Well, by the end of the year he was saying over 100 words! He is truly our "Miracle Max".
He went to that program again a second year and improved again in many areas. He can spell his name, he can count (just about) to ten - but he keeps leaving out number "7". He talks and never stops.

BUT.... 1) his speech is very difficult to understand and in MANY cases you must know the context in which he is talking or you simply have no idea what words he is saying.
2)He is not toilet trained - and contrary to popular belief this has very little to do with our parenting (though many try to tell us it is our fault at this point that he is not trained). He has NO idea when his body is "excreting". So we can have him on a schedule and go every hour and he will go when we take him, but if you even ask him if he has pooped he can't tell you if he has or not.
3) IF he goes to school this year in the way that was proposed to us by the teacher in our last meeting he would go in the morning to the same program he has been in twice already which will make it his third year there. Then he would stay and go to kindergarten in the afternoon. That means that NEXT year when he goes to kindergarten full time he will go from every day school to twice a week school. This is my biggest problem with the whole plan. It will be a huge step backwards for him next year to go back to school twice a week. For all intents and purposes, by next year he will have three years under his belt. I just can't see him doing well in that change. AI AI AI AI AI.

ANYWAY.

I think he should be in kindergarten this year. Shel thinks maybe not? She thinks, and I do agree, that being older is not bad for boys to be starting out school.

Man oh man.

I wont even go into my dilemma about putting him on the bus!