Main time a team will slide adjacent is when the offense is setup in a 2-2-2 open set. You slide adjacent because you can't slide from crease. You might also slide adjacent in certain stunts where a team doesn't want to slide off the crease (if you're trying to lock off a certain player).

So, u can-ish, but ur making all six men slide or creating a longer slide to cover the passing lane. You would also have to have B come off of 2 which opens up a roll back pass opportunity from ball carrier and an easy shot on goal. Having A slide to 4 has the advantage that he is immediately in a passing lane to 4 and can pick him up before he’s a shooting threat. Also, u have C to help out. Lastly and most importantly, you’re almost baiting the ball carrier to make the longest possible pass through multiple defenders while passing cross body. This is a low percentage pass.