Overall, I would say the plan looks fine, and if you have run sub 70 on a tough course then you absolutely should be able to go sub230.
I am very familiar with Daniels - of course he knows his stuff. However, here are some tidbits from my experience.
1) Focus on developing your strength because if it's weak, the marathon wil expose it. It's very likely (and your sub70 shows it) that you have the speed required to reach your goal. So, many runners look great through 20, but are left wondering why the great training failed them in the late stages.
While the schedule & tempos look good, I think there can be a danger of doing the work "too good". By this, take for example the workout of the cruise miles with 10miles in between - a great workout. I think there could be a tendency for someone with relatively a lot of anaerobic talent to do the interval miles even faster than what the schedule calls for... and they may think they are in good shape because they can run the 1600s in 5:08 instead of 5:16 or whatever. But, in reality, they kind of made the workout into something that it wasn't designed. In fact, it would probably be better to have the middle 10 be very solid than to have the average of the intervals be quick. Even then, I can see someone bringing their A-game to this workout so that the next 2 days are both just 5 mile recovery days.
I'm taking too long to get to the point, but my point is that, for the marathon, it's more about a solid overall training package. It doesn't have to have super workouts... consistency and mileage (even if not so fast) are huge. I would rather be able to do the above workout like it was just another day (with sightly slower times) than to be able to pull out a great workout (but requiring a couple of days to recover from).
2) 5:25 - 6:00 minute pace is your friend. I would send more time at these speeds (as workouts, particularly in the last 6 weeks) than Daniels recommends (no disrespect to the coach). 6min pace will feel like an easy workout, but having a midweek workout of 13-15miles at 6pace will be very helpful. On the faster side, I would spend more time at 5:25ish (like 3 X 5K) than I would doing cruise interval miles at 5:15. Sounds like your half training, so I would just continue on with that.
3) Get yourself to the starting line healthy. I know you know this as it so basic. Nevertheless, even the best can be continually reminded of it. This goes for any race - it just seems when adding mileage, etc so many develop niggles that just continually worsen. Of course, as a distance runner, you probably live by the adage that maybe more miles will fix whatever your ailment is! Unfortunately, this typically leads to a crappy last month and/or serious concessions in the race itself. So, ironically, while you do want consistent and voluminous training, it is paramount that you listen to your body and back-off whenever need be. Is much preferable to have done good 70-80m weeks and feeling good than 100s, but feeling beat up and worn down (keeping in mind that everything being equal, I'd obviously rather take the 100s). With this in mind, be careful with the over-distance run. I have done it and felt it worked, and I have also mistakenly done it. I definitely don't think it's necessary.
So, no rocket science here. Just continue to put the work in like you have, putting emphasis on the overall training package and general health (I wouldn't for a moment be concerned about taking the easy days easier than what Daniels has in his book), and a much secondary emphasis on wonderful mile-repeat workouts (though the speed work certainly has its place). Cheers to you running 226 this Fall and then faster beyond that.