I wouldn't advice you to go all in on one coin. It's best you diversify or stay in fewer coins that you can monitor. ADA and Bat are good picks from your list those are solid projects for long term profits hold them tight I think Bat can touch 7k sats if bull run starts also ADA can see its ATH or close to it.
That is not recommending to go all-in on one coin, including bitcoin, because we don't know what will happen later. He should have a plan, not just one plan, but if necessary, he can make more than 3 plan or strategy to face the market movements. Selecting ADA and BAT can be the right choice because this coin is not too high to buy, and I think these coins will have a chance to increase later. But he needs to analyze more to find the good price to buy, and better to make more than 2 order buy just in case if the price is going down for more.