I'm not sure that I would credit the ad removal of the reinclusion request if you are seeing results that quickly. Reinclusion requests normally take a month to get read. This may be more coincidence than causality.
Your right and the more I look into it the less certain about recent returns in SERPs are a result of the penalty being removed, but none the less there has been an improvement, maybe mearly the fact the coop ads have been removed has resulted in the improvement...