I hadn't mentioned the cape or anything from honor rewards because I assumed we were just discussing arena gear. Anyways, while the items can be enchanted/socketed differently, if your goal was to switch into some shadow resist heavy gear it seems like you would be doing so because you're facing a full shadow damage team. If this is the case, there would be better gear to suit this purpose as you can get gear specifically suited for it, or wear some PvE dps gear with shadow resist gems/enchants, because against that team setup resilience is more or less a waste of the item budget, and your season 1 gear uses a lot of it's budget on it.
Using the warrior's Merciless Gladiator's Battlegear compared to the Gladiator's Battlegear, the total base stat difference is:
+34 strength
+31 stamina
+25 melee critical strike rating
+18 melee hit rating
+6 resilience
+639 armor
That leaves you with enchants and 6 variable slots for other stats. Assuming the warrior had SSoE in all 6 slots, that's +72 stamina. Gearing the season 1 gear alternatively, the warrior could get +4 resist all gems totaling +24 resistance to all magic.
Regarding enchants:
Gloves: Both pairs will likely have +15 strength as there isn't a resistance alternative.
Helm: Glyph of Ferocity (34 attack power, 16 hit rating) can be subbed with +20 shadow resistance.
Shoulders: Greater Inscription of the Blade (15 crit strike rating, 20 AP) can be subbed with +7 to all resists.
Legs: Nethercobra Leg Armor (50 AP, 12 crit strike rating) for +10 shadow resist.
Chest: 15 resilience rating replaced by a shadow armor kit for +8 shadow resistance.
Overall that leaves the warrior with:
-34 strength
-103 stamina
-52 melee critical strike rating
-34 melee hit rating
-21 resilience
-639 armor
-104 attack power
To gain a whopping:
+31 to all magic resistances
+38 shadow resistance for a total of 69 shadow resist.
How would anyone ever think that it was worth that much stat sacrifice for 69 shadow resist when you can pick up one pair of the Shadesteel Greaves (
http://www.wowhead.com/?item=32404) which have 54 stamina, 72 shadow resist and will only cause you to lose:
-47 strength
-9 stamina
-14 hit rating
-43 critical strike rating
-22 resilience
To gain:
+72 shadow resist
By having one item that's focused on shadow resist (yet keeping the better leg enchant instead of dropping it in favor of the much weaker leg enchant) you end up with much less stat loss from downgrading, and you also end up with higher shadow resist.