I really don’t think we should choose our heroes to max based on rumors or alternative facts.
First, I don’t think SG will release another pair of HotMs as broken together as Telluria and Vela.
Second, seasonal or event heroes are quite rare. There is a huge difference how many Ninjas there ever will be comparing to any HotM. SG only took action, when nearly all of top players were using same GM-Tell-Vela -defense. I really don’t see how any event hero will ever been as widely used.
Third, Ninjas are more attack heroes. How are people able to complain SG that it was Cobalt who killed their def team? You only see a fraction of your opponents roster, and what you see are more likely def heroes than what are used attacking.
Fourth, It will take ages to nerf a hero. It took half a year to do really much needed nerf to Tell and Vela. It didn’t happen in seconds with Guinevere either. I’m quite sure we’ll hear about future nerfs and buffs before they happen. SG normally gives us info about those things (I know last one happened out of the blue sky, but I really don’t see why they would continue to do so)
I would go with Cobalt and I will go with Cobalt when I get scopes. Poor Alice will be passed once again (last time it was costumed Magni and Ariel before that).