I got it from someone on staff here, but I usually go with a 1+ view on dynasty IDPers. Basically I look at what the guy will do this year and likely the next. Outside of that, things move too fast in IDP world to count on anything 3 years out.
That said, I love McIntosh right now. He is in the prime LB spot in the 3-4 and Fletcher can't play at a really high level much longer. He's had 2 good games and likely is a high end LB2, depending on league scoring.
Washington and Weatherspoon both look the part, but aren't getting enough snaps to be overly relevant right now. Levy is supposed to get the snaps and is a coveted MLB in the 4-3, but has yet to play this year.
I'd rank them from here out for dynasty:
McIntosh
Levy
Washington
Weatherspoon
I like them all for dynasty, but love McIntosh this year and still have high hopes for Levy this year. Washington looks to be earning a full time role faster than Weatherspoon, but I may be wrong on that as I haven't watched either of them closely this year.