i would assume if you had a playmaker, (which i think most of them would be) playing at either 9, 10, or 12, possibly 13 that passes get received and given better, with not as many standing starts etc. so if you had a dot for playmaker and passer you would have a really fast, fluent back line and less drop balls etc. also i think set plays have a higher chance of working. to utilise this stat like i said before, get one with a passer aswell, or at least have a passer at 9 or 10 to the next reciver being a playmaker.
scoring i find difficult to understand. how can being able to score trys affect any stat. i can only imagin that in a set play they would make a bust and have a higher % of breaking a tackle, preforming a sidestep/hand off/sholder charge.