this. very good explanation.
presnap, Enos can move him around (motion) which will force rotation of coverage and exposure of what the defense is trying to take away on that particular play. if you have to adjust two of your back seven players to hold a designated coverage, without some kind of jump or switch call, it's much tougher to disguise what you're doing. this give the QB a nice presnap look at what the coverage is, and takes some of the guesswork out of it. not all, but in that situation, presnap, it's advantage to the QB/OC.
presnap, Enos can use a lot of formation shifts, which accomplish much of the same thing. shifts, as opposed to motion, are particularly useful as it relates to the running game, using formation to either overload as to number, (e.g., an extra guy to help get a hat on a defender to one side of the formation), or to set a leveraged matchup, (e.g., getting your TE to block on a safety in the box, as opposed to a wideout, who may not be as strong a blocker. my big guy has an advantage over your smaller guy. that sort of idea).
and as far as play calling, for example, route combinations that use legal picks to scrape off one defender, based on the design of the pattern is one tool in the kit. (e.g., maybe you run a pattern concept where a companion receiver is shielding the outside bracket in your China concept, or the companion receiver is shielding the under coverage in a Texas concept. it all depends.
the point is, it's not just "getting him open" that the OC needs to adjust to, it's using that doubling of one player to go somewhere else.
and remember, whatever the OC does, the DC on the other side will be trying to counter. that's the chess match, and why you watch on Saturdays.