What you need to do my friend, is thoroughly research your question yourself. The ladies and gentleman that browse these forums cannot make a decision for you regarding where you do your training.
I appreciate that it is a difficult to make these decisions. However, on saying that we have all been there with a different story to tell. I would suggest you go to a number of different schools and get a flavour for what they are like. Talk to the instructors and the students. You will be surprised on what you can get out of doing this. From reading your post, it looks like you have done it at one school.
I am not sure where this idea comes from with regard to doing all your training at one school, I have never come across an airline that dictates this? As long as you have that little blue book with the ticks in all the right boxes, you are good to go. I think, and this only my opinion, what the airline will be interested in is you. When you sit there in that interview, you will be judged on the person you are and what you will bring to company. God knows why I was employed
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Work hard, make sensible decisions along the way, make contacts, and keep chipping away, and believe me mate, you will get where you want to be if you have the heart and determination.
All the best with it.