There was some speculation that this delivery would affect the market but realistically the volume was too small to matter that much. The contract expired yesterday and the spot market went sideways for the next 20 hours.
Yeah, I do see the logical sense in those gaps of markets reopening and rushing in to meet the last known price, again, temporarily before equilibrium is met. Reading a bit more on this options thing and it seems it's Deribit who's got the largest market share of options and their own CEO doesn't think the impact will be significant now or in the future.
Hard to predict irrational sentiment though right?