But Bradie and Gabby are nearly the same age (born within a month of each other). So I think it's unfair to hold it against Gabby that she's been a senior for longer and has done more. She has actually accomplished more than Bradie, at the same age, unless you value a GP medal above a world one. You also mention that Bradie won bronze in the Olympic team event but ignore the fact that Gabby won gold in that same event. (Edited to add: you also left out Gabby's Worlds medal.) Selective memory much?
My post was responding to everchan's post---which I quoted, and which mentioned Gabby's OT gold. And I did mention Gabby's World medal: "Gabby competed at her fourth Worlds before winning a medal"---and that's in my post which you quoted.
Yes, Bradie and Gabby are pretty much the same age. But it is MUCH harder to get on the World team in the US than it is in Canada because the competition in the US is much stiffer. Consider that at the Olympics, the lowest of the 3 US ladies finished 11th; the lowest Canadian lady was 25th. At Worlds, the lowest US lady was 12th (and she was the second alternate); the lowest Canadian lady was 25th.
Gabby was able to compete at Worlds (13th) and Olympics (17th) in 2014, a year when Bradie was 4th at US Junior Nationals. Bradie won the 2015 US Junior championship and made it to 2016 and 2017 Senior Nationals. She was 6th in 2016 but then suffered a serious back injury and was 9th in 2017. She won the 2018 US Championship.
In the US, 2013-2016, to get to Worlds, a skater had to make top two; 2017-2018, top three. Some skaters finishing 4-5 were able to go to 4CC if one or more of the top 3 declined to skate there in a non-Olympic year. Otherwise, if age-eligible, the only ISU championship available to top 6-9 skaters was JW. Bradie went to JW in 2016 (11th) and 2017 (7th).
Bradie's first senior competition ever was the 2016 Tallinn Trophy Challenge where she won a bronze medal, despite her back injury. She didn't do another senior international competition until Philadelphia 2017, which she won. It was quite a huge shock for Bradie to win a medal at Skate America, win the US Championship, and then have her next competition at the Olympics, having never competed at a senior ISU Championship event.
Also note that Gabby hasn't undergone a major growth spurt the way Bradie has. When Bradie won her Junior title she was under 5' tall. She grew 6 inches in less than two years to become the tall, leggy skater she is today.