When you order from Spyke the abilities associated any unlocked (i.e., "?") slots have no relation to those of the gear that you ordered, as they are determined at random at the time of purchase.
There are some nuances involved with the odds of you getting what you ordered, but basically after you get to level 16 if you order gear from Spyke with three determined sub abilities the odds governing what you actually get break down as follows:
Chances of matching 0 sub abilities: 30%
Chances of matching 1 sub ability: 60%
Chances of matching 2 sub abilities: 9.5%
Chances of matching all three sub abilities: 0.5%
Notice that in the case of an RNG miracle you can actually get what you ordered!
There's a bit more to it than this, so check out the link below if you're interested.
http://splatoonwiki.org/wiki/Spyke