I've just been training a little bit of everything. I think the reason I got so many pops was because I got lucky and my player started with high sublevels on many skills.
Well, I haven't been as lucky to have the triple pop, but i think for my guy with the 14-16 pops this year is due to higher sub-levels. I too have been alternating his training to try an keep an many of his core skills similar to eachother to allow me the most flexibility with training the two others on my team.
As far as the level of trainer goes, i have found the ongoing discussion about the differences between the 5/6/7 quite intriguing, but not quite enough so to test it out myself
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"In my body where the shame gland should be, there is a second awesome gland... true story"