I agree. They’re going to want to add a left-handed bat and basically only have a handful of options to do so: RF, DH/1B, & C. And when you actually look at the free agent options, there aren’t a lot of quality LH hitters at those spots.
To me, not prioritizing Grandal would be crazy even if you still think Collins has a decent chance to stick at C. McCann is a nice player (I was 100% wrong on him) and has done a great job with Giolito, but Grandal is a significant upgrade and a much better fit. And I’m not against the idea of going into 2020 with a three heading catching monster of Grandal, McCann, & Collins, with Zack & Yasmani basically splitting DH duties. Trade for a RF or simply sign a stopgap (if you want to buy time for Walker / AA guys) and you suddenly have a very nice looking offense. That would definitely be my plan on the positional side unless they are willing to go balls out for Rendon.