Is it worth the switch?

Vesa has added a lot of survivability to my team, everyone at the moment is very squishy. Im on VC 2-5-6 (stuck on King Barton wave). Im thinking of switching Vesa to elena to boost LoFa attack/hp. Also would use the resources from Vesa to boost SQH. I have no sublimations unlocked on any other heros other than LoFa, only 45k away from having noble everything on him. Is it the right move?