Here is the truth. Reed's history of cheating means we always look at every decision he makes with a very suspicious eye. In this case he may have made a mistake or he may have cheated. The problem is it is very difficult to identify a ball at a distance without picking it up, especially with so many tour pro's using Pro V1's. I guess we should give him the benefit of the doubt here since he is taking a penalty drop
I am not sure it always happens but players usually show each other their ball identification marks before the beginning of the round.
From my perspective if one of his playing partners confirm that the arrow mark is kosher then in my mind I am going to move on having discharged Reed honorably. There are greater co-incidences than another ball in another tree with the same arrow marking and really nothing more than an honest mistake in the ball identification.
P.S. Sorry, just read this.
If so, I guess it is entirely possible to follow the ROG to the T with no integrity at all.