It's not impossible that Senior has a card though. Looking over his 2014-15 checklist, he was contracted with Panini that year, and did appear in most of their releases (with many scans to show it's really him in other sets). Billy said it right though; Panini is terrible with their own checklists. I'll never understand why cards need to be numbered with letters, in any situation. It's almost like they're trying to conceal something.
I'm going to reevaluate how I collect after the new year. It's just getting way too expensive for the new stuff. Sometimes I just want to buy a pack, not a whole box or even blaster.