You can also observe BTC Major Downward motion in CoinMarketcap Dominance.
of course bitcoin's (what you call) dominance is decreasing. when a shit coin like DigiCube (the screenshot above) can be number 3 or ethereum or other couple of hundred altcoins can easily create marketcap (which is a simple number) then share of bitcoin goes down.
Trying to Discredit LTC by trying to link it with some coins that were randomly pumped.
i am not discrediting LTC, litecoin is one of the solid coins and one of the old ones but that doesn't change the fact that it is being pumped because of its
SegWit activation. and in the end it won't make it good in a way that you are thinking.
Here is your Problem,
BTC is secured by the Chinese Mining Pools,
LTC is also secured by the Chinese Mining Pools,
this is irrelevant.
BTC has a coinbase wallet , which makes it easier for merchants to use.
LTC will be gaining access to a coinbase wallet, which will increase merchant usage dramatically.
this is also irrelevant. coinbase is a web wallet account not a payment processor and they add altcoins that have high volume so that they can earn money from the fees they take from people buying them or trading them in either coinbase or Gdax.
Also if you went by trading volume LTC is already the #1 coin according to
https://www.worldcoinindex.com/ , since they rank by trading volume and not marketcap.
None of your random coins have that going for them.
what you don't realize is that trading volume goes up when people are trading the coins, and people trade coins when they are getting pumped. go check the volume of February and you'll see.
then go check the volume of some shitcoins during their pumps and you'll understand.