The lures shown are pretty large for 5" and larger bluegills have pretty large mouths in comparison to lure body size. As long as #6 jig head hooks are used, fish will attack and get hooked on moderately sized soft plastics such as:Even large bluegill have small mouths and so using a larger bait doesn't make as big of a difference as it does with fish like bass and crappie.
These gills on the small size aren't exceptions to the rule, they are the rule.