Sorry but I am a bit confused here, what do you mean by sentinel because I just went to check for the meaning of sentinel in the dictionary and I got a very different meaning that is not and can never be in anyway related to the blockchain.
Hence, I am sorry to ask, where did you see that dash was sentinel and any coin that implemented sentinel cannot be removed and can you please give me an example of the coin fork from dash which just have POW and without sentinel, don't mind me for asking this questions, I am a coder now looking to be a crypto developer hence love to find out new things.
I am referring to this:
https://github.com/dashpay/sentinelDash engineers either don't know exactly what it does or don't want to say how to remove it. Or many it is not so easy to do.