From a charting point of view nearly all stocks cover gaps, i would like to say all, but some stocks that have very poor liquidity dont.
ION will cover its gaps and there is a small one @ $1.60 and a major one @ $2.29.
I truely believe that it will retrace up to cover the gap at $2.29.
I dont hold this stock, yet, and am waiting for the confirmation of the turn before i get in.
Regards
Stu