Tristana has the best disengage, by far. I agree on that. But Jinx has "free" as which allows her to melt towers much earlier than Trist. And her rockets give her better AoE (Tristana's AoE is only on kill, champ or minion). Also, While I love the disengage Trist has, having two LONG range skillshots should not be discounted. Jinx can hit opponents that Trist can't; and not just because the range is further but because Jinx doesn't need to SEE them like Trist does. Zap is a really good ability and the ult is what it is.
Range: Jinx rockets beat Trist at all levels (which is bs IMO), and zap is solid poke/harass that goes well beyond anything Trist can do
AS: Jinx can use minigun to shoot faster than Trist all the time
Siege: Jinx's siege (with minigun) is stronger than Tristana's, MAYBE giving exception for very late, but the bomb bonus is not worth the Q cooldown, ESPECIALLY since you practically need to use them in communion with each other. Yes, Trist's Q uses no mana, but it DOES go on CD, whereas Jinx's minigun does not (also, Jinx has ever so slightly more default AD)
CC: It's easy to dodge, but Jinx has an actual root as well as a slow neither of which require her to get INTO harms way. Trist has no stuns, silence or roots and her only slow requires her to be on top of the target (thus, in range of at LEAST 1 opponent)
Movement: While Tristana DOES gain a reset on her jump after a kill/assist, it also DOES require mana. Jinx gets a free speed boost on kills, assists AND demolition (Trist doesn't get that) that doesn't require any mana or even "activation".
EDIT: Also, regarding "burst", Jinx's rockets can CRIT, any "burst" you wanna give to Trist can't. (the "burst" from bomb is pretty poor since it's timed/requires 4 hits, and jump is at BEST on par for DAMAGE to Zap, but more dangerous for Trist by far)
Also, Trist didn't "steal" ANYTHING from Jinx, since Tristana has been a LoL champ for much, MUCH longer, even IF I wanted to accept your premise of her having spotlight from certain abilities (which I don't necessarily agree with), it'd just be Trist taking BACK what was hers to begin with.