Rango is drawing on the energies of the 3 but he is not the 3 type.
Instead of just saying "he reminds me of Don Knotts" (because of The Shakiest Gun in the West similarity, and you might not have seen that movie so that will be lost on you), I see a character who is fighting against insecurity. The plot of the movie drives him to act out the "heroic defender" role, in other words, he has to be the opposite of the coward that he starts out as. At first he only plays the hero role by drawing on the 3 energies, and only out of a need to survive; then he is accepted in the group and becomes a part of that group, although still playing a role (kind of like a type 6 glad-handing salesman); but in the long run he is forced to cast that aside and just be himself. The snake made his personal growth necessary, but it only occurred after a time of personal reflection and an external discovery upon being cast-out. Toward the end he is an unhappy paraiah, the group has rejected him, so he crosses the highway in despair not seeming to care about his fate (type 6 Level 7). As Riso writes, "they are disgusted with themselves for not having been tough enough to stand on their own two feet, to defend themselves, to be independent. They feel cowardly because they have not been able to sustain their aggressive stance, although not because they have not tried."
In the end, Rango uses his own intelligence and courage to outwit the natural predator and the evil mayor.
As an aside, it was obvious that the Mayor was the villain from the very first, wouldn't you agree? The whole movie was pretty easy to see through, and heavily laden with tropes and cliches, kind of what one would expect from a Western.