I heavily disagree that they should have been in the same slot, and it's mostly because of the Shadow Labrys example you pointed out. Labrys and Shadow Labrys both play very, very differently and it's evident that it's the same with Sho and SHO, so putting them in the same slot would have been more confusing and pointless than putting them in separate slots. SHO being added to the same slot location would not guarantee an extra character at all.