Prior to that bout both men under-went their physical examinations and it appeared that they belong in different weight classes.
The obvious different between the two men were the height and reach with Taguchi having a 7.5cm (3") height advantage and a 6.5cm reach advantage. We know Taguchi is a gangly fighter, especially at 108lbs, but those advantages are genuinely huge.
In terms of the neck both men were the same, 36.5cm, whilst Kwanthai had a 0.5cm around the chest.
Whilst Taguchi is clearly the bigger man Kwanthai does have his own advantage, notably his experience with almost twice as many professional rounds as the champion and more than twice as many fights. Whether those will help the challenger or not is a totally different question, though he'll believe they will when the bell sounds to begin the fight.
Ryoichi Taguchi makes first defense against Thai veteran Kwanthai (Preview)
(Image courtesy of boxingnews.jp)