Now Leggett enters an important spring and summer for his career. Mandatory minicamp starts Tuesday in Florham Park, and Leggett says he is somewhere between 90 and 100% healthy. General manager Mike Maccagnan allowed tight end Austin Seferian-Jenkins — the Jets’ third-leading pass-catcher last season — to walk in free agency. The team didn’t sign another tight end to replace Seferian-Jenkins. Instead, they drafted one in the fourth round, Chris Herndon out of Miami, who was charged with DWI in New Jersey earlier this month.