Let your pastor think of something else and not bitcoin because he will run at loss if he invest on short term like he said, especially if bitcoin price dips. Also bitcoin investment is not a shopping mall where you can feed from daily.
I completely agreed with your points, considering the fact that Bitcoin is not a quick and get rich scheme, patient is a virtue and worth prioritizing in Bitcoin investment, the power of dcaing is consistency and holding for as long as 4 to 10 years and above of having a compounded value of investment over the period of time, Bitcoin investment is best performed when viewed from a long term perspective and not short term, the man is old and might not enough psychology to withstand the pressures that comes with the news and the emotional devastation that is attached to trading Bitcoin for term profits, I will also suggest that he should consider another investment plan and not Bitcoin.