Hi there,
When you say that two of the charges don't make sense, do you mean he is denying that they happened? If he is only pleading guilty to the former charge and not the latter two (i.e. he intends to plead not guilty to the two charges) they case will probably go to trial (at the Crown Court) where he will be able to defend himself before a jury. Either that or the two charges will be dropped at the discretion of the CPS (which is unlikely given that it's ABH).
I think i've understood what you mean here, if you think I'm confused just let me know and i'll have another look.
Best wishes