I think it’s a gain, as you can level them all up to lvl 4, tho it takes a long time

Oo oki, ty!!

As enchanted said.

YAAAAAAAS MAAAAAAAM

I would say L just because you had one already to level 4, and now you have to start over again, however it could be also a G because now you have more gecko's to level it up.

GGGGGGGGGG

Gain! Gain!

Ty guys, now I can build my army

Gain! You can easily level up your geckos.