Yes but let's be honest, players decline in their 30s. So even if his decline isn't as apparent as others, you're still paying an exorbitant amount of cap for a declining player. That money could be spend on other aspects of the team. This is a rebuilding team. You know what was another rebuilding team that went after a big FA that destroyed their cap tree through both the initial signing and its implications on the other upcoming players: Toronto when they signed John Tavares.
If you can get Huberdeau for 9AAV for 6 years, I'm all for it. But I don't think he'll want a contract so low