Irina would never bother to do such combos because she didn't need them under 6.0. Did anyone actually land axel combinations like 2A+3T in the old system? I agree that overall Yu-Na has the edge because of the jumps she adds to the 2A but the jumps itself is not definitely "far better" than Irina. What are those 5 difficult entrances? I remember Yu-Na doing a spread eagle and ina bauer entry to axel, nothing more. The sheer jump is comparable with Irina who has a little bit more height and power to it and holds the edge for a long time with well-extended free leg, what Yu-Na does not do. Irina did not have any difficult entries but performed her double axel with a very short set-up or right after her 3F using just the flow she had after the flip.
http://www.youtube.com/watch?v=h8Lr_dgpX9E&t=3m34s
http://www.youtube.com/watch?v=waquBqyrAvg&t=3m17s
This is very nice. No time to prepare at all, no crossovers, showing how easy the jump was for her.
And here we have a wonderful 2A with this edge held for a long time and again the set-up is very short:
http://www.youtube.com/watch?v=2uIvHWQ7vyY&t=1m52s if this doesn't have the flow and height then I don't know what has...
All of those above are comparable to Yu-Na but this one is simply superior. A perfect textbook +3 2A with no telegraphed entry, big height and distance, tano variation, wonderful flowing edge in and out of it, good extention of the free leg (this is what Yu-Na lacks) and a difficult/creative exit with those change of edges (Mao used it as well in her Clair de Lune 2A):
http://www.youtube.com/watch?v=kQVwA28Jm-w&t=1m41s
Interestingly, the varied position in the air did not affect the distance covered and spring.
I'm not saying Yu-Na has a bad 2A or something, it's fantastic but I would just give a tiny edge to Slutskaya.