This will be the 8th year in the NFL for the Titans new tight end Delanie Walker. But so far in the league he has never had more than 30 receptions in a single season. Historically speaking tight ends that are receiving tight ends usually are doing so by their 3rd season in the league.
If Delanie Walker has over 40 receptions in 2013 he will be the very first tight end in NFL history to do so in their 8th season of the league without having eclipsed that mark earlier in their career.
He is predicting that he will have 70 receptions. If history has any relevance then he will be extremely unlikely to even reach 40.
Something else to consider is that in 2012 he dropped 24% of passes thrown his direction. Highest drop rate in the league.