I don't really see any power forward available that would fit EDM's young core to be honest. Young power forwards are pretty tough to trade for. If they can get lucky and maybe sign Clowe in the off season but he's not really a long term solution. Maybe try to sign Horton also.
Last year was the first time RJ Umberger has missed games to injury in the past four seasons - his entire Blue Jackets career. He played 77 games.
In that same period, Hemsky has yet to MAKE IT to 77 games in a single season - his tops was 72 in 2008-2009 - and he's only exceeded that once in nine full NHL seasons (the year after the lockout). Umberger had more goals scored in 2009-2010, and more points scored in 2010-2011, than Hemsky had games played in either season. And they're one year apart in age - both roughly at the same respective points in their career arcs.