Help Me Learn Lepitaur Posing

So I copied your poses into gimp, here is my analysis of each one 

A-1 Looking at the feet, they line up. The eyes are also even, also indicated alignment. I know we've talked about cat poses before and the "back leg gap", lepitaurs don't really get that big of a gap naturally without being slightly out of alignment so the tinny one in this is perfect(Some judges may put more value in that but since it's a wild I go for legs). He appears to be in a maximum breathing point(what you want) which is how you get the right tail alignment. 
 
 
A2, this pose has the same positive alignment points as A1, including the tail. The biggest difference is that in this one you can see both eye triangle edges on the outside of the eye on both eyes. For this reason I like this pose better than A1. 
 
You're right, the alignment is not the best in this pose, Look at the feet there is a pixel off. The gap is bigger than A1 or A2, which usually means good alignment in catz. The tail alignment isn't perfect either, it isn't the perfect inhale but it is close.
 
A4, you can see alignment off, there is absolutely no gap between the back legs(which very few breeds actually have this) and the head tilt makes the expression "eh" and it is further from full inhale than A3.
 
A5, we have the same  issues as A4 only the head tilt is even worse. I've seen very few judges that actually like head tilts so I don't recomend having them in a pose ever. 

If I were to rank these poses from best to worst I would got A2, A1, A3, A4, A5.

 
B1, So looking at the feet the line shows they are aligned only a pixle off. Considering how small the lepitaur community is right now I doubt it is much of a big deal. You have a nice expression. The tail though(drop tails are difficult) isn't as "high" as it could be, indicating it isn't the top breathing point but it isn't super noticeable that it isn't either.

B2, again we have a nice expression with the slightly unaligned feet. The tail however, notice the slightly larger gap between tail and bum? This to me indicates the higher breathing point that we want.
 
B3, again we see slightly off alignment, and a nice facial expression. The breathing point seems okay but the tail looks kinda thin. If I had to guess I would guess they were twitching their tail when the picture was shot. With a longer tail there would probably be "kinks" at the time  but with this short one it just looks skinny.

I would rank these from best to worst B2, B1, B3

There are multiple things to keep in mind and some judges put different weight on them. Like the head tilt in A4, some judges might like it/find it cute. Personally Between Expression and Alignment are the two I put the most weight on. If the tail is obviously not in position I will pay attention but not if it's only slightly off.  I hope this helps some, if I can clarify anything just let me know