I must have had 20 instructors in my time...
I did a Flying Scholarship, 3 years on a UAS, my PPL, and tailwheel differences training. Most have contributed valued experience. A couple could have learnt from me...
I've got about 110 hrs dual, so please apprieciate that my 20 instuctors (some who only flew with me a couple of times) do cover a long period.
On the UAS, you could have flown with any instructor at any time, each had their own character and emphasis, but most importantly, standards were very high, and there was very little difference in procedure between them.
That is the most important thing at any school, and is the CFIs responsibility to maintain. Of your instructors haven't got a common theme, 'report' them to the CFI - and if neccessary, complain. It is your money. They should all be singing from the same song sheet.