Which franchise single season record will be hardest to break?

[CJD]

I think the rookie records will be very hard to break. Burrow's yards and td records will probably be beaten by him later in his career, as will Chase's franchise yards record, but the rookie records, each player only gets one shot at them. If they're injured or otherwise not in ideal circumstances as a rookie (aren't day 1 starters, haven't developed chemistry with teammates yet) they can't try again the following year.

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