post-bankruptcy rallies are mostly dependant on who owned the stock and the type of market we are in. A stock like AIG is owned by some very large funds and weathy people, so they can manpulate the stock all day long. AIG isn't declared BK yet, but sooner or later it should happen. In my view they keep it on the exchange as a favor to big owners.
Or like TMA, which got booted off the exchange after a lot of "stange" moves.
But stocks like INGN where only idiots owned it at the end don't get to soar. Or they have to languish for many months. Especially in this type of market.
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