In practices and preseason games, the top tight end pairing has been Jake Ballard (Gronkowski’s spot) and rookie Zach Sudfeld (Aaron Hernandez’s old spot). Ballard is a strong blocker, but even he acknowledged that he can’t match Gronkowski in the passing game. Those two look like they have a strong grip on roster spots, with veterans Daniel Fells and Michael Hoomanawanui possibly battling for a third spot. If Gronkowski is kept on the 53-man roster, it’s possible both Fells and Hoomanawanui might be affected as there might not be room for four tight ends. Economics could also be a factor as Fells is scheduled to earn a base salary of $1.25 million and Hoomanawanui $1.3 million. The Patriots might find those salaries rich for a No. 3-4 tight end.