Preventing with ID. Work on the shot with SB . I tattoo this on my arm

Yeah, my bad. SB not only blocks the shots but works to limit the damage.
Using your data (your first big) we can say that if the opponent takes 20 FGA he will go 6 times to the rim and 1 time to the for two FT. With more ID the opponent will have less FGA. Is this ok?
I agree that with less ID my player will prevents less shot. And this is the point: more FTA for the opponent (and less for his teammates) but more power to blocks or alters those "bonus" shots.
Maybe what I've not understand is why he will give more open shots (=easy points).