Further confusion as to whether a first round pick is a high pick or a low pick

Interesting that in their opening game over the Rams, the Eagles' top picks were benched and the the later picks played:

1st: Danny Watkins (OG) - Did not dress
2nd: Jaiquawn Jarrett (S) - Did not dress
3rd: Curtis Marsh (CB) Did not dress
4th: Casey Matthews (ILB) - Starter
4th: Alex Henery (K) - Starter
5th: Dion Lewis (RB) - Starter (as kick returner)
5th: Julian Vandervelde (OG) - Not sure
6th: Jason Kelce (C) - Starter
6th: Brian Rolle (OLB) - 4th Linebacker