I disagree with those that think Hall and Yak don't make good linemates. I think they would give teams fits trying to control both Yak and Hall on a line together. When they are "on" and playing well that is.
Hall has speed and drives offense and Yak has a super shot when he can get it off... give those two a solid creative 2 way centre and I think that would be an excellent #2 line.
Hopefully Draisaitl develops into that because with his size and smarts... playing with Hall and Yak could be a deadly line.
In the interim Roy is ok... but not really ideal because he's not as solid defensively or big enough imo to play #2C longer term... but as a transitional player... he'll do.
Lander hopefully continues to produce and develop in a 3rd line role... and hopefully Yakimov can also be an option up the middle.
Hall-Yakimov-Yakupov could be a decent future trio as well.
Any solid line needs a combo of speed, size, shooting and solid defensive skill... and optimistically we hopefully have that in the pipeline.
The 1st line has that to a degree already with Pouliot-RNH-Eberle... now just to make 2 more lines similar to that plus add about 3 more decent dmen... and a couple goalies... and we're golden.