So what your best guess is that alpha omega is 40" for the harness
I measured her and she looks to be around 32" and if I did the torso right then 12" there. So would she be long torso?
NO! NO! NO!
TOTAL height means NOTHING! It is ALL about torso height. PERIOD. My dd outgrew the both your seats WAY long ago. She wouldn't have fit in the AOE past about 22 months old, which is when her torso height hit 14.5 inches. Her total height at that point was about 34 inches tall. Granted, she is long-torsoed, but even a more average kid is NOT going to make it to 40 inches in this seat.....
If her torso is 12, and the top slot is 14.5, you have about 2.5 more inches of torso growth. That could be up to 2 years? Or perhaps as little as one? Either way, you are pretty much guaranteed this seat won't harness a kid past 3, even a really small, short kid.
that means, at age 3, you have to buy another harnessed seat ANYWAY. Just get one now, because at least you can return ths seat, and get the money back for it, whereas in a year or 2, you won't be able to. It's a crappy investment.
(I also agree, the triumph looks to be too short, you need to replace that one as well. )
ETA, to give you an idea of how VERY different the torso measurement versus overall height can be, the pp said her daughter is 41 inches tall with a 15.5 torso, and she is 5 yrs old, and my dd is 36.5 inches tall and just shy of 3 yrs old...but ALSO has a 15.5 inch torso!!!!
So you see, a 2 yr difference in age, and a 4.5 differrence in overall height - but yet the same torso height!
Kids REALLY do vary so much...the AOE is just not worth the money, get something with higher slots. Really.