My major complaints are the shouler and knee pads, and the pointed helmets.

Take them away and Guardian's would be feasible.
Vindicator's would be pretty much like her V2 costume, so again feasible.

There's the debate over Electromagnetic/Geothermal vs armour, but after the amount of times the Guardian/Vindicator suits have failed, I could be persuaded to see the logic in armour for them, against an armoured Juggernaut.
However here Juggernaut's armourless, and between the experience of Mac & Heather, their ability to fly and attack with force/geothermal beams/whatever from a long range, they seem kinda redundant. Especially with 3 against 1.

But overall, the idea of an armour isn't too out of the question, as the 'Am-Can' suit originally was portrayed as.

Sas however is basically wearing Juggernauts armour once you take off the accessories.

For human Walt, again like the other two, it's feasible, but I don't think he'd need them in Sasquatch form against Juggernaut, and definitely not an armourless Juggernaut.

A flesh eating bacteria like in V2 maybe ( ) but against Juggy... meh, doesn't mesh with me.