PHILADELPHIA — The Eagles are where they usually are in May: a perceived contender about to kick off on-field OTAs with enormous expectations. This year, a greater sense of uncertainty surrounds the typical equation, however. In the Jalen Hurts era, the quarterback sits at the center of it, facing what’s been described as a crossroads season for the Super Bowl LIX MVP. Never a high-volume thrower, the absence of a consistent running game exposed inefficiencies in the passing game with Hurts at the helm. He has now posted consecutive seasons with a passing game ranked in the bottom third of the league. That resulted in the most significant change to the offensive coaching staff since Nick Sirianni arrived in Philadelphia. Outsider Sean Mannion takes over as offensive coordinator, replacing longtime Sirianni confidant Kevin Patullo. The team also added minds like Josh Grizzard and Jerrod Johnson, while reshuffling the deck with Parks Frazier stepping in as quarterbacks coach for Scott Loeffler.…