Shot location analysis of the Canucks PP:
TL, DR: Daniel Sedin only found success when he was playing in the slot, not at the point.
Garrison has fairly effectively replaced Ehrhoff. The real problem is the left point, where we haven't been able to replace right-handed shot Salo (Hamhuis sucks there).
http://canucksarmy.com/2014/1/14/heat-maps-on-vancouvers-power-play-formation
I dunno, I disagree that Ehrhoff's value to the powerplay was generating shots from the point. He was certainly a bit better at one-timing the puck than Edler, in that his wind-up was quicker and he didn't need to be in a perfect position like Edler seems to need to be, but he didn't spend all of his time anchored to the point.
Pass it to Bulis have written a couple of articles on it, and i agree with the idea that it was the roaming nature of Ehrhoff that was his most significant impact on the powerplay - he was by far and away the most mobile player on the unit (you can see it from where his PPGs were scored). This not only had the effect of generating good quality shots for him - but IMHO for others as well. Ehrhoff was easily the 3rd best passer on that team, and he was very quick at moving the puck on the PP. Significantly quicker than anyone this team currently has bar the Sedins. Edler, D.Sedin and Samuelsson (after Edler went down) all have much higher PP SH% in 10-11 than they do in other years. The movement of Ehrhoff caused issues for PKs in terms of coverage (you know the dude can wire a puck) - they lost their shape and ability to predict where the shots were coming from. That, combined with his and the Sedin's ability to move the puck to each other or the point/net men (Edler, Samuelsson and Kesler respectively) was what made that PP so dangerous.
Further to that canucks army article - I don't agree with any notion that Garrison has replaced Ehrhoff. While I think his SH% will climb (regression), it's not going to get significantly better to the point where the PP is as dangerous as it was. His shot is more powerful than Ehrhoff's, but they don't have the same role. Garrison is the guy you want where Edler was on the 10-11 PP, while you have an Ehrhoff moving around, helping with puck distribution and most importantly clearing shooting lanes and being able to feed it back to the point. In a similar manner to Campbell setting him up in Florida - if you watch the videos of his goals there, most of the PP ones came as a result of a very mobile PP drawing the PK out of position for a clear shooting lane.