He is still improving sharply, so I don't see that stopping too soon. He ran 1:48.6/4:02/8:41 last year and has improved five seconds in the mile this year already. Last year, he dropped 4-5 seconds from indoor to outdoor. If he does that again, he's in the range of the national outdoor record. He's also run 8:03 3k this year. As for pure speed, he's not comparable to Lutkenhaus, a 46 type, but has good speed for a miler with a 49.4 400m as a junior and that's fine for an 800/1500 time with range. Lutkenhaus could well be a force at the mile in the future but Powell is there right now and with the 1500 types going down to 800m, the really fast times don't typically come until they are much more aerobically developed. With Webb, we saw the 47 carry already in high school but it wasn't until 2007 at his peak that he dropped until 1:46, all the way down to 1:43.8. So, I wouldn't expect him to be competitive with Lutkenhaus at 800m for years, if ever.