Who is the second most important player on the Titans in 2015?

We have spent every day since the draft talking about Marcus Mariota.  There is no doubt that he is the most important person in the organization going forward, but who is the 2nd most important player for this team in 2015? Let me know in the comments.  Give me your player and the reason you think he is next in line after the rookie quarterback.

I will come back tomorrow with my thoughts on who it is, and with some thoughts on the comments that are posted.

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