I was a fan of Mercer from the day we even didnt draft him yet. He was great in qjmhl full season and playoff games. He was one of the most "fun to watch" prospects all season. But I think he must try to play AHL top-6 role for better translation of his game on adult level. I dont know how well he will play center role on NHL level, I dont think he protect zone well, but he is pretty good on the boards and in forecheck and I think he will grow in great two way winger.
I watched a lot of SHL games of Holtz and all of his AHL games, plus wjc. I think he has a lot to develope in his game and he needs in good center. He didnt have one in shl in the second half of season, in sweden squad and in ahl.
I really do think devils can try use Foote in NHL. And may be Clarke too. But not on the same line. And i`m afraid Clarke will not suitable for bottom-6 role. This is just an observation, a lot can change over the summer. Clarke has significantly improved his game over the previous year. Perhaps he will be able to take another step forward and be more active in forchecking.