"why the value of altcoins are still trailing behind wherein bitcoin has increased by leaps".
this is the reason why some of us wont agree that btc and alts are corelated because if they did and really are then both coins are now on the same position .
it's not scripted and many might have noticed that the value of ETH was all-time high when the value of bitcoin started to dump after the 2017 bull run.
it isnt because if its scripted thay would be mean that alts will follow whatever btc are doing or it can still be scripted but done in different ways and not in the same manner so that people wont suspect .
better if we are this way so that we still have an oppurtunity to invest on the other side because if both alts and btc are on high , people will find it hard to invest .