On the topic of glide I have to say that I believe that it is still mimicking forage. IMHO The difference is in presentation. It's true that fish don't swim in a wide gliding s pattern and it may not be a "natural" style of swim but it still meets the classification of natural looking forage.
Take a hamburger and wrap it in lettuce instead of a bun. It's still a hamburger.
A glide bait looks like a fish and it swims.