When you're evaluating an ankle sprain, always look for positional faults of the distal fibula (as described by Brian Mulligan) on the talus.
The athlete will typically present a pinching sensation in the vacinity of the anterior talofibular ligament with weight bearing dorsiflexion. A few mobes combined with the recommended taping procedure usually brings a pretty significant relief. It's not a wait & see thing-either it works or it doesn't.
The theory is when the ankle inverts it gets locked against the ground; but gravity continues to drive the fibula down & forward onto the talus. It's not hocus pocus- it has been documented in the literature. I just don't think it's as common as they say it is; but when it works it works. The problem is coming up with a exercise protocol to keep the correction. Haven't found one yet.