Groups of pumps and dumps should be caught as this is a serious problem in the cryptocurrency. You don't take advantage of pure market movements, but you manipulate a whole market to your own will and bait people to join you in the rise. I wouldn't call it clever or creative, but rather illegal, depending on where you are. That's why I have never participated in those. It's pretty much stealing.
Every trader and investor is having some contribution in making market down or up so if you decide to change your bitcoin to Altcoins it will reduce the price of bitcoin. So we should try to keep the Bitcoin safe and instead of changing we should keep out bitcoin safe and try to increase the number of the coin in your portfolio.
I don't think that a single transfer could affect the price (unless it amounting a lot of Bitcoin).
He might be overthinking that altcoins could give him a big shot since altcoins price are cheap nowadays. But the realization is that what if Bitcoin do the bullish and leaving altcoins still down? I don't know if what he feels, it for sure of his big regrets.
Yes no doubt bitcoin now is at low price but with the passage of time it will be high. We know altcoins are also good to invest but it never give profit better than bitcoin. We know bitcoin is at demand now a day so its not good to exchange your bitcoin into Alt coins. Altcoin are in ETH and Ripple but I prefer to keep my bitcoin saved instead of changing them.