28) Because those skills aren't affected by height or age, and they are trained by team training, which is a lot different than the regular training you give trainees. Also FT and ST are generally not really trained early on at all, except for maybe during the allstar week or the end of the season when teams only play twice a week. They are generally valued a lot less than the other skill points, so putting them in the same overall number (TSP) doesn't really give a fair comparison.
29)
(229484.1), the Training Simulator is a nice tool which is updated pretty regularly by Rhyminsimon, in the tab "Coefficients" there are interesting stats about training, like age and height factor, skill elasticity and training speed. There you can see that if you train 1v1, you get a lot of skill points for your training. DR, HA and JS are the main beneficiaries from that training, and they are trained by other training forms too (like JS, Inside scoring). That's why they train fast, and a skill like OD which is only trained by Pressure goes slower.