In fact, objectively speaking, this matter was explained as early as the theatrical version. At that time, Diga Altman was still dark Altman, the leader of those people. Super Guruluye War, Altman War of different races, even Diga Altman participated. However, it is said that this super-old civilization was destroyed by several ultramen. It can be concluded from this statement that Diga Altman is a super ancient demon Altman with super strength!
If there is any weakness in the strength of Diga Altman, we all know that the three forms of Diga Altman are weaker than the dark form in strength, which can be seen from the performance in the play. However, in the end, Diga Altman became a flashing form, and a shining form using the power of countless giants of light appeared in the theatrical version. The power of these two forms has been improved, especially the sharp form has defeated Demonozoa, which means that this form is stronger than the flashing form.
But there is another situation, that is, Diga Altman died a long time ago, so he has no sense of independence. Before, no matter how Quercia Goriat Levente Jova Camilla mentioned the past to ultraman tiga, he was indifferent. In other words, Diga Altman's consciousness has long been lost, just an empty shell, and Otani is just manipulating Diga Altman.
In fact, there are many Altman who can only use it once, such as Diga Altman. I don't know. Do you remember? For example, after absorbing many heroic forces from generation to generation, Tejia became Jia Ling Altman, defeated monster gleim, and their strength returned to noumenon. Afraid he won't get it again. There are also super Tyrol, triple slimming Teja and so on. Their situation is like this.