Question on pork butts

Probably the number one lesson (among a few 100) is to taste it first. I lot of injection & rub flavor will cook out. Taste it to see if you want to add more flavor or not. Don't just blindly plan to add, let your taste guide you.

When I do PB, a good suggestion is to grind up some rub until it's a dust and sprinkle it on just before service. Not in the crock pot but on the sandwich or platter. If you need to add flavor just sprinkle on some rub, mix it up and taste again.

I do of course go buy taste and not blind add it in. I was just wondering if there was a reason one shouldn't add the injection and use some instead like apple juice into the crockpot just to add some moisture. Never thought of grinding a rub down to a dust tho!