the only reason this could be true is because of the upcoming block halving, but it's a transitory and momentaneous thing, don't ride too much that wave...
Litecoin halving is still approx. 3 Months away. What we are seeing has nothing to do with the halving. It has to do with oversold conditions and rock bottom prices. From rock bottom it's easy to rise. From rock bottom it can per definition only go up. Sellside on exchanges was so thin everyone could have spiked LTC 15% up with just 500$
Bitcoin has never arrived at rock bottom and people are actually afraid of the event of Bitcoin hitting rock bottom. Some alts have been there last year already. Alts are good to go up from here. They have hit their definate rock bottom price. Bitcoin still has some way to the bottom. Remember: we are still in accumulation phase and the built in high inflation just makes sure it's going nowhere but that issue has been discussed here many times already.
Bitcoin is quite old now and has so many problems. Starting with slow and small blocks, hardfork turnoff, drugmoney/pedophile/mafia-status in the public image, user unfriendlyness, large blockchain, high inflation, bad distribution, bad actors, bad foundation, high electricity consumption ... and the list goes on!
Litecoin is still a virgin and so are many other coins. And they come with smaller chains, better distribution, faster blocks, smaller cap and thus more opportunity to profit from pumping it and so on and so forth.
Really bitcoin is just a bunch of problems and alts are just a bunch of solutions.
The only unfortunate thing was this cult like pumping and promising noobs 1 million for a coin and megalomaniacing about 'all transactions worldwide' and so on. It just went all a bit too far. Even so for as to try to sabotage progress and work against decentralisation ideals (the thing that made it big in the first place).
Time to move on i think and become an early adopter of another promising cryptocurrency project. Don't fall in love with your investement. Especially not when it's only going downhill.
More diversity in the space won't hurt anyone. The bitcoin fetish is also not rational or because people actually "support the tech". It's just greedy cult behaviour created by baghold. Time to evolve.