in 2015, it's obvious that he cheated. the 18:34, 18:30 and 19:03 splits do not make any sense. the 19:03 split is on the hilliest part of the course, the 18:34 was preceded by a 25 minute 5K, and the 18:30 split (5:57 per mile) is followed by a 2k split at 7:00 per mile . no experienced marathon runner (particularly an age graded 2:09 marathoner) goes from running 5:57 pace between 35-40k to slow by over a minute and run 7:00 pace for the final 2k (which is slightly downhill).
w/ respect to derek, this is a huge opportunity for him, b/c it's not just the 2015, 2017, 2018, or 2019 la marathons, but there's a host of other races that he's cheated in... the numbers don't lie.
check out the splits from the la half marathon in october - posted in early april (page 7 of this thread) . a seasoned marathon runner does not run the first 1.5 miles at 6:38 pace, dial it back between 1.5-3.1 miles, to cross the 5K mat at 21:50 (7:24 pace), drop the pace to 6:32 per mile between 3.1-6.2 miles, dial it back to 7:09 per mile between 6.2-8.2 miles, pick up to 6:48 pace between 8.2-10 miles, and then run his fastest 5k (3.1 miles) between 10 miles and 13.1 miles at 6:31 pace. that just doesn't happen.
fm, come clean and move on. there's a group of high school kids (and alums) that don't know what to think, but, they can't ignore the numbers and the facts on the previous 35 pages. fm, you made this mess, it's now time to clean it up. you have no one to blame but yourself. do the right thing.