On the threshold of the 5* tier

Sooo, I partially pulled from my hoard two weeks ago, deciding to pause once I hit 13 covers on a 5*. I ended up with a 4/5/4 Gambit, 4/1/1 Murdock & 3/2/0 Thor. Also, a number of low-priority 4*s that I need to deal with now.

Currently languishing on the vine:

• X-23 (2 unusable green, good for extra iso)
• War Machine (2 unusable red, more extra iso)
• Thing (2 red, potential champ or more extra iso)
• IW (1 unusable green)
• Falcap (1/1/1, potential champ)
• Winter Soldier (1 purple, 1 red, potential champ)
• Elektra (1 black, 1 purple, potential champ)
• Spider-Gwen (1 yellow, potential champ)
• Black Bolt (1 green, currently 5/4/3)
• Thanos (1 black, currently 5/4/2)

Options are to champ one or more of those 4*s, save iso to champ Gambit, spend cp to purchase last Bolt cover and scrimp iso to champ him (unlikely, with Medusa at lv304) or build up iso buffer for when I go back to latests (122 pulls as of now) before Daredevil leaves in hopes of getting him to 13 covers and likely needing to champ Gambit (and/or others).

Opinions welcome.