Read's offense used more set patterns for the WRs, and utilized several variation of screen passes, if you'll remember. when DD dropped back to pass, he went throw his progressions to find the open receiver, but he knew what pattern each receiver would run. With Stitt's offense, the receiver has more leeway to run to an open area or seam, and the QB must be on the same page or the result will be what we saw in both games..... that is, Brady and the receiver not on the same page. This cause interceptions and throws to seemingly nobody because the receiver broke the opposite way than Gus thought he would.
Did you ever wonder why Brady is really the only QB out of the five to "get it" so far? It is a really difficult offense to run for a QB. Read's not as much.