Im not trying to make you look bad or anything but I think he actually WAS being very careful, because he only started with 7g's and then felt nothing after 2 hr's and then dosed 7 more, and then barely felt soemthing, and then dosed 7 more....so 21g's total, and he still wasnt happy with the results. Just because the pods you use would have caused an overdose in that amount doesnt mean he has the same potency pods, im sure you know that the potency varies GREATLY between different types of pods, sizes of pods, and vendors....etc.. It sounds to me like he was being safe and dosing in smaller incriments until he found a dose that worked(which I dont even think he found actually). So to be honest, the way he ingested those pods is pretty much how I would have reccommended him to do so because he didnt know the strength and was "testing the waters" slowly until he finally go atleast a little high. I really dont know of a safer way to do it thats actually effective. I mean sure, he theoretically take like 2g's at a time and wait an hour or two before dosing again until hes high, but given his first experience using 7g doses, I doubt that would go well.
My advice to him now would be to start off with like 14g's and then wait a while and then dose accordingly after that.
But you are right, safety is always the most important issue but I think he was acting in a safe and responsible manner.