PHILADELPHIA — Dave Dombrowski’s first responsibility is to win the next World Series. His second is to win the ones that follow. His third is to stay within a reasonable budget. When he signed right-handed starter Taijuan Walker to a four-year, $72 million contract Friday, Dealin’ Dave crossed a significant “T” in fulfilling his responsibilities. In March, he dotted a meaningful “I” when he signed Nick Castellanos to a five-year, $100 million contract. He knew that, come November of 2023, two homegrown cornerstones — Aaron Nola and Rhys Hoskins — might be walking away with more cash than the …
