The inferential -miş borrows its personal endings from the verb ´to be´ as well.

We can say the same things for -miş as well. But I am not sure if it was used with "to be" in old times. I don´t have a "Grammar of old Turkish" book around. I can tell that aorist tense suffix was not used that way in old Turkish.

What I´m saying is you can treat aorist tense (-er) + future tense (-ecek) + inferential tense (-miş as if "to be" sentences. (you can see the same thing in a different way)

Thanks, si++, this was interesting. What a good grammar day.

Thanks alot 
Henry (I was surprise with your link)
thank you  Abla   and  Si ++

your reply is very useful I understood and I´ll intend to learn Turkish well.

Here is what I had heard about Aorist tense from another Türk (native) tutor. I hope this does not "ruffle any feathers"

is it also true that for a verb is one syllable, and ends with l, n, or r, you would use -ir, -ır, -ur, -ür?

example; geler ;incorrect,  gelir ;correct

-verir

However, other 1 syllable verbs use -er/-ar examples; giter, Koşar

Also, that if a verb is multiple syllables, you would also use -ir. 

example; kapatır, konuşur

Yes! have you followed the thread links given in this thread? I already have provided the details for it, which I will not duplicate here.