O.K., I am sorry also to be irritable. I simply was trying to point out that the insertion of a sustain is essentially the same thing and also allows you to use other patches to link to a legato transition. But I understand what you are saying.
I think I have noticed what you are talking about - there are some inconsistencies between different "types" of samples - for example, staccato tends to be a bit more extreme in dynamics. Also, the legato patches, depending on which version you are using, may have fewer layers so you are right that it may not match. I am speaking only about the full extended versions of the libraries, but I basically have found doing switches from crossfade to note-on velocity is a way to deal with this. In fact, doing instantaneous switches between crossfade and note-on allows all kinds of effects - such as the forte-piano-crescendo - which is a dynamic orchestral effect that I always use but does not exist in the dynamic patches.