You provided examples assuming where a potential big trainee would start and just ran with it. Not everyone hits a respectable JS big. Normally the skill is far lower. You don't need to go balls-to-the-wall on training it.
The claim that 1v1 guards trains HA faster than 1v1 forwards is also unsupported by the data and therefore incorrect.
The data I reference does support that. Simply because you don't use it does not automatically make it incorrect.
The suggestion that the OP should train ID first disregards both the fact that the training speed of various inside skills depends on their relative value to one another and the fact that the order in which you train the skills has an impact on salary/cap due to the (unwanted) training of the skill you are trying to punt. SB also has a higher baseline training speed than ID.
Training ID first was assuming all things being equal. And it's usually trained first (and just in case you missed it...assuming all things being equal) because it has an elastic effect with all other inside skills. And as for your point about SB training I'm not certain why it's relevant. I simply mentioned other users have rotated back-and-forth with that and ID.
Furthermore, you really need to understand that BB is a shrinking community with a low level of forum participation. Having the same handful of users berate and demean others in every thread isn't helping.