It doesn't need to be.
If a team has only two draft picks for a season, but they are 3rd overall and 7th overall, then that team is in a better position than average, despite only have two picks.
The role of second-tier prospects is being overrated here. Historically, first rounders are far, far more likely to be all-stars than anyone else. Look at the draft positions of this year's all-star teams:
1st - xxxxxxxxxxxxxxxxxxxxxxxx (11 of these were top-5 picks)
2nd - xxxxxx
3rd - xxxxx
4th - x
7th- x
8th -x
9th x
not - xxx
The point is that highly ranked prospects are much more likely to make an impact than second-tier guys. A couple of years after drafting, I would bet that this effect is even more pronounced, as we have more information about the players - the rankings now (assuming we could agree on them) would probably be even more predictive than draft day. Given the choice, it's usually a good idea to go with the team with better top-end talent, not the team with better depth. Again, Toronto vs. Ottawa is close, but Ottawa should definitely be ranked ahead of the likes of Carolina and Chicago.
Why should Sens be ranked higher then Hawks
The Sens forward depth isn't as good as Hawks
Maybe I am just too big a fan of my own team but
Sens top forward prospects
C Jakob Silfverberg
C Loui Caporusso
RW Bobby Butler
C Jim O'Brien
RW Erik Condra
RW Roman Vick
LW Andrew Petersson
C Colin Greening
LW Kaspars Daugavins
RW Markus Sorensen
Hawks top forward prospects
LW Jeremy Morin (2nd rounder in 2009)
LW Kyle Beach (1st rounder in 2008)
LW Kevin Hayes (1st rounder in 2010)
C Marcus Kruger (Did well in playoffs and late season with Hawks)
C Brandon Pirri (2nd rounder in 2009)
RW Jimmy Hayes (2nd rounder in 2008)
LW Ludvig Rensfeldt (2nd rounder in 2010)
RW Ben Smith (Did well in playoffs)
RW Igor Makarov
LW Philippe Paradis (1st rounder in 2009)
I mean to me it is very clear , Hawks forward prospects are a lot better.
Defensively the Hawks have some nice prospects as well
D Nick Leddy (1st round in 09 ,, Playing in NHL)
D Dylan Olsen (1st round in 09)
D Shawn Lalonde
D Stephen Johns (2nd round in 2010)
D Justin Holl (2nd round in 2010)
I mean again maybe I am overating the Hawks prospects but to me our prospect pool looks much better then the Sens