About Babidi's mind control

To be fair when Krillin got hidden power unlocked on Namek I think he surpassed Tien up for a bit. I'm sorry, but I don't buy into DB fandom idea that Piccolo, Yamecha, Tien, and Chaozu made these huge increases on King Kai's planet in six days. Maybe by the time they came back Tien had made some big improvements, but I don't buy that in those six days they were there on Namek that they made the same increases Goku made. True Goku's increases were still remarkable in a short period of time, but he still had 2 or 3 months. The only thing to support they made huge increases during that time was the filler where they beat the Ginyu Force. That has enough problems since it implies King Kai is stronger than them, despite him already admitting he was weaker than Vegeta and Nappa back in the Saiyan arc.

Tri-Beam is the same boat as Destructo Disk. It uses the user's life force as oppose to ki, which is why its so powerful and allowed Tien to overcome enemies more powerful than him. I don't think it is fair to count it toward Tien's actual power anymore than Kaioken being counted toward Goku's overall power. Don't get me wrong they are useful and powerful techniques, but they aren't exactly techniques that depend on the user's ki level like Kamehamaha is. Tri-Beam was the only reason he damaged Nappa, the same way Destructo Disk would be the only thing Krillin had to damage Nappa. In fact Tri-Beam is the only reason Tien did most of the feats on your list, such as stall Semi-Imperfect Cell and deflect Buu's blasts. 

I don't agree with Tien being taken with Goku as indication he was stronger than Krillin. True he asked Krillin to get Yamecha out of there, but I don't think he left Krillin there is a indication he was weaker. Your argument implies Krillin, Gohan, and Yamecha were all left behind because they were the weakest, while Tien and Piccolo went with Goku because they were the strongest Z-fighters barring Vegeta at the time. That makes sense for Piccolo, but I can't say Tien was stronger than Gohan. The kid made huge leaps on Namek and trained with Goku and Piccolo, while Tien trained with Chaozu. This the same arc Gohan goes Super Saiyan. He must be very strong at this point. I don't necessarily think that is a good indication of strength levels for the characters. I would argue Goku asked Krillin to take Yamecha because Tien is more prideful. He is not Vegeta proud, but he was always a prideful warrior, certainly more so than Krillin. Krillin was more likely to go without argument to get Yamecha help. Tien might not have gone without argument. After all part of the reason he went to help Piccolo with droids and Cell was being fed up of sitting on the sidelines and not being useful (which to his credit was very helpful), but still at least a bit of pride issue. I could be wrong, but it just an example of how its not all about power that went into that decision of who would take Yamecha.

I do agree that Tien continued to train while Krillin stopped fighting is a good argument for why he is stronger. I wouldn't be surprised if he was stronger than Krillin, but I do also think if it was also true that Krillin was stronger due to power up the Grand Elder gave him giving him a edge that Tien might not have been able to surpass. I think it is too close to call with these two and ultimately moot, since Uub is without a doubt the strongest human thanks to retaining the potential he had in his previous life as Buu. I wanted to throw my hat into this debate. Also I accidentally liked my post when trying to edit it. I just wanted to throw that out there, so I wouldn't look like a complete narcissist.