These would be my picks from your lineup as well. I guess you’re running Telluria with Vela flank as tank, so I don’t see an immediate need for Santa.
Depending on what level your alliance is facing in war, I would decide in whom to max first…
If you face a lot of Telluria tanks, go for Grazul and get her a level 11 mana troop to protect your team. You can flank your Telluria with Marjana in the meantime until JF is ready to go.
If you’re facing more purple/yellow/blue tanks in war but run greens yourself, I would focus on JF first as the synergy between Telluria, Vela and JF is amazing.