Bloodthirster is often seen as a "Crutch for worse players who can't kite well", but for Jinx in her modern condition it's practically a must, I totally agree. A great pick if you're not steamrolling your lane, and in most cases you indeed don't, Jinx is a hypercarry after all. Also Wit's end not only gives you the damage and MR, but also a hefty amount of much needed mobility!
You never want to build botrk unless you know you will end the game before your 3rd item. Its scaling falls off FAST because you delay your I.E. which delays your lord dom's
I think PD outperforms LDR in every dimension, if you go an expensive item 2nd I think it has to be BT. LDR second just doesn’t have competitive damage as people arnt exceeding the armour value at which it’s needed when people are building second items.
Dummys dont have levels .... i put 150 armor onto the 2nd target dummy, which was at the time semi average for about level 11-12 for champs that buy armor