Cash Shop Specials: 6/19 - 6/25

Unless if you mean new locks that lock the actual line in question, locks are completely pointless now. You can't go down in rank on your inner ability lines, and once you hit S rank you're forced to use the cash shop circulator.

Edit: Apparently the regular ones can go down in rank from C-A? But once you hit S it's still stuck there anyway. And you want S rank to begin with.

It's called rare-epic-unique-legendary instead of C-B-A-S. But yes, basically what you said.