the gmt nivada, i've seen you post on tz before. i can't remember much about it, except it was a good looker. is that one a poor man's heuer?

a question(s) for anyone who knows(just added here to not have to post twice and the two set of questions are aligned slightly).

did heuer make all these poor man's because of a need for cash flow? or was there a mutual business agreement between heuer and poor man heuer brands. meaning did heuer and other brands make watches for each other? i remember reading at one time that the french made dive watches were made by a different company, due to heuer not being tooled to make them initially. did zodiac, hamilton, clebar, lejour, etc make time day/date only type watches for heuer after heuer was tooled for sport chrono's? if i got any/all of my guessing wrong feel free to correct.
thanks in advance!

j.h.