In "Power Rangers Super Megaforce," the Mega Force Rangers have the ability to access the powers of previous Ranger teams thanks to the "Legendary Ranger Mode," which is a key feature of the season. This capability allows them to harness the abilities, weapons, and transformations of past Ranger teams, effectively becoming them for battles.
The storyline typically involves elements of legacy and the continuous fight against evil forces, along with the theme of teamwork and unity among the various Ranger teams throughout the Power Rangers franchise. The power to transform into past Ranger forms is a narrative device that allows the Mega Force Rangers to tap into a vast history of Power Ranger legacy, which is vital for combating formidable enemies that threaten the world.
The reason they can stay in these past forms (like "Gorms," which seems to be a typo or misunderstanding of "Zords") can be attributed to the series' imaginative lore, which emphasizes a connection between all Ranger teams. This allows new teams to stand on the shoulders of their predecessors, reflecting the ongoing battle against evil and the shared legacy of the Power Rangers.
Additionally, the "Super Megaforce" storyline involves elements like the "Morphing Grid" and the concept of Ranger powers being accessible to those who are worthy, further reinforcing the idea that past Ranger powers can be utilized by new heroes.