Well thank you Jo for your time and explanation!
I learnt a lot about the gphoto lib with this and it's highly appreciable. !!

So you right in mRaw & jpg it was all OK (except with the dev-driver that i found today) -- but honestly i did not try the sRaw before, for me if mraw&jpg were fine the sraw should have beeen also....
But making the full detailed test for the tmpfiles.. i discovered the sraw doesnt pass to the rpi3 ! Strange....

I posted the same results to gphoto issue team.. keeping finger crossed it will give thdm some ideas !

I will keep posted any progress here for the sake of the community and if anybody has the same issue .. (i would love to know if anybody with 5d3 & pi3 get same results btw ..)

Best regards,
Pask

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