Boom - Adam Erne and Valentine Zykov, both are pretty cheap (and stay cheap somehow?). I want to say Erne is a 4.5 and Zykov is a 4.5 yellow (the yellow font is impossible to see).
Bust(ish) - Aleksander Barkov (4.5 yellow) and Kyle Okposo (4 yellow)
A little background for this assessment - I'm in my third season as BAGM with the Caps and I started atthe 2013 draft. My current roster, other than a couple of names you might guess, is wholesale different from the one on the ice right now. I didn't make any moves pre-draft, but Aleksander Barkov always falls to the 15th spot (simulated three times, he's always there) or wherever the Caps draft. I felt pretty lucky when he did, but more on that later.
I immediately went to get Adam Erne from Montreal (was trying to get as many USA juniors as I could) for a couple of picks. Midway through my first season I traded Laich and Green for Okposo and Stepan (who had somehow made his way to the Islanders). Okposo was an 83 ovr and 4 yellow (I think).
So, where are they now?
Okposo - in the 2015-16 season he's now 84 ovr and his potential turned white (meaning his growth or ceiling is fixed?) in the first off-season. Hardly any growth, but I like playing with him on my second line. I had hoped he's be a nice fit on the top line with Ovechkin and Backstrom, but I find he's better playing with Stepan on the 2nd line. Is "role" is also "2nd", so he's in the right spot.
Barkov - traded at the start of the 2015-16 season for Zykov. Barkov was a 71 ovr but was not really showing me much. He spent his first season in the CHL and didn't improve at all, so far as I could tell. The next year he was in Hershey and a perpetual pain in my arse as I always had to put him back into the lineup (tried to play his with 77+ ovr scoring wingers). He jumped up a bit, but still wasn't a default starter on the Hershey Bears. I decided to move on. I wanted a young, top-line RWer and I was shocked to see that Barkov's trade value remained pretty high. High enough to get to Zykov straight up, who was coming into the season rated 81 ovr. Couldn't be happier with this move...
Zykov - no idea where his rating started, but I got him in the off-season at an 81 ovr and he jumped to 84 by the end of training camp. He's playing RW with Ovie and Backstrom and he is a pure sniper. Slower than I'd like, but all of his shooting stats are close to 99... and it shows. He's Behind Dourin in the rookie scoring race with 37 grapes with 22 games to play. Awesome player and his trade value is somehow very low (and hasn't changed even with his jumped up ratings?).
Erne - Also a coup, got him for a song and he's has progressed a lot like Zykov. He was in the CHL for two season and came out as an 81 ovr. By season start he was 84 ovr and he's got a killer shot as well. Bigger body than Kykov (who is big himself) and can really hold the puck in tight spots.