The team is losing because they aren't very good. IMHO Coughlin and company tried to build an old school team in the modern NFL which doesn't work anymore.
Fournette, huge contracts to Linder and Norwell, are holdovers from an era where the power running game won Super Bowls. We have no move tight end no receiver to move the safeties out of the box and a QB that is mentally weak when crap goes wrong. The current rule set even if the defense plays amazing leaves this team as 8 - 8, maybe 9 - 7 in a weak division. Time to move on.