Monsters that could have fallen to a lower zord finisher
 

Here are my lists.
Monsters that could have fallen to a lower zord finisher and the zord
finisher

*not a zord finisher

Monster Fell to
Could have fallen to

Scorpina's pet worm MegaDragonzord
Dragonzord Battle Mode
Samurai Fan Man Ultrazord
MegaDragonzord
Fang Ultrazord
Dragonzord Battle Mode
Cyclops Ultrazord
Dragonzord Battle Mode
Fighting Flea Megazord
Tyrannosaurus
Dramole Ultrazord
MegaDragonzord
Two-Headed Parrot Ultrazord
Megazord
Rhinoblaster MegaDragonzord
Dragonzord Battle Mode
C. Crayfish/M. Rangers Ultrazord
MegaDragonzord
Pirantishead Thunder Megazord Power
Blaster (aimed too low)*
Saliguana Thunder Megazord Red
Dragon Battle Mode
Nimrod, AC, and DC Thunder MegaTigerzord Thunder
Megazord
Silver Horns Thunder Ultrazord
Thunder MegaTigerzord
Showbiz Monster Thunder Megazord Red
Dragon Battle Mode
Needlenose Thunder MegaTigerzord Thunder
Megazord
Arachnofiend Shogun Megazord Battle
Borgs

Monsters that survived low zord finishers and what they were

Monster Survived Finisher

Frankenstein Monster Megazord
Hydro Hog Shogun Megazord
Impursinator All Zeo finishers

Feel free to add/correct anything I may have missed or added wrong.