I am not scared at all about the development, they are smart investors, had those amount of bitcoin and probably saved it up somewhere safe, and then are okay with the profit they have made so far.

You can just assume they wait for another all time high, they have been saving those bitcoin for year and high chances they have seen several all time high and even lows, in summary they have all made good profits from their investments and are ready to reactive those wallet.

In terms of if it would affect the market, it would to a degree but it won’t be something to worry about, there are lots of accounts like that, that’s how popular bitcoin is.