sure, the possibility exists, but given what we do know, particularly that his rate of assists per innings played is basically identical, it is unlikely. you give baseball players, and the wavin' wendell's of the world too much credit. not only is that inference unlikely given the data and absence of any observed accounts supporting it, it's impossible to quantify and therefore wouldn't factor into ARM anyway. you know, if it was actually trying to account for such things. not necessarily. we can easily conceive of a situation where an outfielder could become more efficient at creating throwing outs yet still not become more valuable because of it. this is because not all throwing outs are created equal. throwing out ryan theriot at second base with two outs is not the same as throwing out carl crawford at home with no outs. run probability matters. there's also a difference between intelligent, skilled baserunners choosing to challenge the arm of an outfielder who has previously been in the infield his entire professional career, and some grindy, low-efficiency baserunner who tries to squeeze an extra base because he "plays the game the right way." skill level matters. but not to ARM... aside from failing to account for the situational run probability as well as the skill level of the baserunner, it also fails to account for the most important piece of the puzzle: the fielder! particularly, where they are standing at the time the ball is hit. this can be as intricate as using the pitch f/x system to also pay attention to the activity of the fielders (which, as far as i know, it doesn't, and is probably the biggest flaw to the system), but even accounting for the defensive field the player is in would be a great start. preventing a runner from advancing to third is easier, all things being equal, when you're on the left side of the field. oh but hey it accounts for park factors and the amount of blue cotton candy sold that day so, there's that.