But with Iginla there doesn't seem to be any concerns about his game. I admit I say this not having watched any of these players but just reading off what others have said. But Eiserman seems to be a one dimensional player and Yakemchuk, like most defencemen, there are always questions at how well he'll defend at the next level. Yakemchuk is also a year older than Iginla.
As for age, I'd say you're correct there is more runway for a younger player but I'd also note the year they were born is important as well. I'd expect more production from a player born late in the year (Oct-Dec) because they should be a year ahead of the other draft eligibles.
My thoughts on Iginla, based upon secondhand info, is that he's a player who probably fits with the identity the team would like moving forward. To go along with his skill, he wins battles for pucks, he's strong, and he's a good two way player. Those aren't attributes I'm hearing a lot for the other potential picks for the Sens.