Jungle Cubs was one of the best/weirdest classic Disney cartoon series because, while on the surface it's just your classic "your favourite characters, but as babies!" series, with all the cheesy songs and cliches that that suggests, the fact that they chose to do this with the Jungle Book characters— and have for some reason chosen to include the villains in this premise— lends the whole thing such a weird sense of pathos.
Literally all these characters end up disliking each other to a certain degree. When you watch the original film, none of them are still friends.
Even for Baloo, Bagheera and Hathi, the nominal 'good guys' in the original film, the full extent of their relationship as adults is 'Can Coexist In The Same Space Without Actively Trying To Attack You', which is a step up from how Kaa, Shere Khan and King Louie behave, but is still pretty bleak.
(Baloo and Bagheera do at least end up bonding again over Mogli, but they're not particularly friendly at the start of the film.)
There is an entire implied but unspoken tragic epilogue to Jungle Cubs, where the characters grow older and start to develop their adult instincts, species divides grow stronger, and they one by one either stop showing up at or are driven away from The Cold Lairs.
Every song, or joke, or laugh shared between these characters implies a poignant Last Time sometime after the credits roll. Every adventure is lent a certain dark irony, by the knowledge that many of these characters will surely resent these decisions to rescue their friends from danger later on in life, when the time comes to try and kill them.