For someone using the DCA, lump summing is always good when a dip happens because it doesn't make any sense buying all in when the price is still high and for investors that have good cash flows they can solely depend on lump sum whenever there is a dip lower than their initial buying price but for investors with low income they are mostly the ones that used the DCA but that doesn't mean that if a DIP comes up when they still have some reserved funds that they shouldn't lump sum, they can still lump sum and continue DCAING later on.
If you can never buy and deposit bitcoins with the DCA method without depositing money, you will definitely need cash to buy bitcoins following the DCA method. If you invest in DCA method repeatedly then your portfolio will surely grow and if you continue it as per plan for long time you will surely get maximum benefits. Because in the next future you will own bitcoins for sure.
Bitcoin investment requires regular cash flows at regular basis because that is the only way a huge portfolio can be gotten whether if it's someone accumulating using DCA or lump sum.
Many people are afraid to buy and deposit Bitcoin with cash and they deposit it in the bank is a complete misconception. At present if buy bitcoins follow DCA method and accumulate for long time it will definitely be big portfolio. Because if you look at the price of Bitcoin a few days ago and the price of Bitcoin at the present time, the price of Bitcoin took a huge dump after the halving and is now almost on the road to recovery. I think Bitcoin hoarding will be the highest good and noble investment.