Let me explain why that's not right.
The TT is a 5-25X56 measuring 16.75 inches, with a 5X zoom ratio.
The Genesis is a 6-60X56 measuring 15.75 inches, with a 10X zoom ratio.
In a riflescope, the magnification is a function of the objective lens focal length divided the eyepiece focal length, then multiplied by the erector zoom. The TT's base mag is 5X to the Genesis base mag of 6. I have no clue what the objective FL and the eyepiece FL are for either riflescope but since the overall lengths are fairly close, I would expect there to be little difference between the various FLs. There will be some but nothing like comparing short scopes to long scopes of the same magnification. The size of the image at the FFP should be similar.
Since both riflescopes have the same size objectives, 56mm, Dawes limit (resolution) will be the same. The differences between these riflescopes are the zoom ratio, the type of glass and the internal adjustment range.
I think doing the comparison at 25X magnification is very fair. This is obtained by the zoom lenses at 5X for the TT and 4.2X for the Genesis, again, pretty similar. 5X zoom ratio is pretty standard, almost mundane in this day and age, whereas 8X and 10X zoom ratios are rarer and bring in their own challenges. So if you were to compare a March 2.5-25X52 to the TT, the March would be at 10X zoom ratio to the TT's 5X zoom ratio, but by your argument that would be fair because they are both at the top end of their zooms. (I'm ignoring the difference in objective diameter.) But it would not be a fair comparison because of the amount of zoom being used to reach 25X for both riflescopes.
The current comparison at 25X is actually quite fair because of the same objective lens diameter and similar zoom settings.
In my estimation, the differences in IQ are due to conditions and optical path. There, the advantage will go to the Genesis on both counts. The Super ED lenses in the TT are more resistant to IQ degradation due to mirage than non-ED optical glass, and the optical path in the Genesis will always be the optimum because the adjustment is done externally.
