Nice cherry picking of data sets there. Again, I don't think RD had any influence on how Ike plays in Brawl(given that Ike's appearance and most of his animations are taken from PoR, plus the fact that he was revealed within a year of RD's release).
Ike's Brawl playstyle was pretty much pulled out of Sakurai's a$$, because there's nothing in PoR that suggests Ike should be a Mighty Glacier like he is in Brawl.
I'm going to compare Ike's stats to a couple of different characters: Zihark(A Fragile Speedster), Gatrie(a Might Glacier),Nephenee , Boyd, and Oscar)
[collapse="Growths"]Ike:
HP: 75 Str: 50 Mag: 20 Skl: 50 Spd: 55 Luck: 35 Def: 40 Res: 40
Zihark:
HP: 55 Str: 45 Mag: 15 Skl: 50 Spd: 60 Luck: 40 Def: 30 Res: 20
Gatrie:
HP: 80 Str: 55 Mag: 5 Skl: 55 Spd: 25 Luck: 25 Def: 60 Res: 30
Nephenee:
HP: 55 Str: 40 Mag: 20 Skl: 55 Spd: 55 Luck: 35 Def: 25 Res: 35
Boyd:
HP: 75 Str: 60 Mag: 5 Skl: 50 Spd: 45 Luck: 35 Def: 25 Res: 25
Oscar:
HP: 55 Str: 45 Mag: 20 Skl: 50 Spd: 45 Luck: 30 Def: 35 Res: 30
More[/collapse]
[collapse="Average Stats at Lv 20"]Ike:
HP: 51.5 Str: 26 Mag: 10.6 Skl: 27 Spd: 28 Luck: 19.3 Def: 23.2 Res: 17.2
Zihark:
HP: 44.95 Str: 24 Mag: 7.35 Skl: 29 Spd: 30 Luck: 17.6 Def: 17.7 Res: 7.8
Gatrie:
HP: 58 Str: 29 Mag: 3.5 Skl: 24.5 Spd: 14.5 Luck: 12.5 Def: 30 Res: 12
Nephenee:
HP: 43.6 Str: 22.8 Mag: 9.4 Skl: 28 Spd: 26 Luck: 14 Def: 22.2 Res: 13
Boyd:
HP: 60 Str: 30 Mag: 2.85 Skl: 24.5 Spd: 23.65 Luck: 16.95 Def: 16.25 Res: 11.25
Oscar:
HP: 48.8 Str: 24.2 Mag: 10.2 Skl: 26 Spd: 25.2 Luck: 15.8 Def: 22.6 Res: 13.8
More
[/collapse]
Here we can see that, while not the highest around, Ike's speed stat is higher than average. Additionally, his stength may be somewhat high, but it's nothing compared to Boy or Gatrie(two characters who could be considered to be very powerful).
[collapse="Weights"]Ike: 9
Zihark: 10
Gatrie: 16
Nephenee: 10
Boyd: 10
Oscar: 33(mounted units weigh a lot more than non-mounted units)
More(along w/ bases)[/collapse]
Here we can see that Ike has a surprisingly low weight(it's even lower than Volke's if you can believe that), though he's not the lightest(mages and characters like Rolf and Sothe have much lower weights).
So again, there's very little in his ingame stats to suggest the Mighty Glacier playstyle that Sakurai came up with for him.