4 Star sentinel still worth ranking as a cavalier player? (Variant 3 in mind)

So I'm at 6.2.6/v2 100%/v4 2 paths left for 100%/v3 one run through and v1 ch2.1. My team is 5/65 CMM, domino, aegon and blade. My tech champs are 4/55 ghost/darkhawk/star lord, 6 r1 red skull/yondu/rocket raccoon and a 4/50 sparky.
Since we got a r2-4 gem from halls of heroes I'm wondering if it's still worth ranking sentinel for variant 3. Are there any paths or fights specifically for sentinel that I would still struggle with even though I have this roster?
I'd much rather rank my 4 star ronan or one that's fun to play that I don't have a 5 star version of. What are your thoughts?
Since we got a r2-4 gem from halls of heroes I'm wondering if it's still worth ranking sentinel for variant 3. Are there any paths or fights specifically for sentinel that I would still struggle with even though I have this roster?
I'd much rather rank my 4 star ronan or one that's fun to play that I don't have a 5 star version of. What are your thoughts?
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So IMIW, sentinel is good for that fight. However seen video of summoners using tech boost on and fully boosted soled that fight with ghost.
In my personal run I took around 60% health with ghost and when he was about to heal back quit the fight and did rest with sentinel.