I think I have a pretty long saddle setback (94mm). I think it's because I have long femurs but not 100% sure.
Anyway that means that the bars have to be pulled backwards so accommodate for that, hence the need for a shorter TT, stem and bar reach or combination thereof.
T-rex doesent really exist; its a rider preference rather than a requirement.
Is your leg at 90ยบ in the first stretch?
How close can you get to the pic in the 2nd pose and hold it?
How long can you hold a plank?