Hmmmm
I'm not convinced by this... "only one provider" concept. I used in total 6 training providers prior to employment. And just casting my thoughts to anecdotal evidence of my collegues, many came from a "multiple provider" background.
Each person's predicament is different. When choosing a training provider, there will be factors already discussed such as reputation, results, facilities, instructor and aircraft availabilty, atmosphere, etc. There will be further personal factors such as home location, finance, learning styles, family commitments, work commitments that will, and I believe should, all contribute to the decision making of where you train.
So long as you can come to a rational and well thought out explanation for your choices then I don't really see the problem in chopping and changing. After all, that is one of the benefits of the modular route.