Stop being analitical!

[Torsten]

As you yourself have noted, word beginning t and k tend to become more common when prefixed with o. However, while the further prefixing of q makes many words beginning qok more common again, word beginning qot become less common. Thus the actual content of words - the presence of t or k - is important. There could be several explanations for this, but it suggests that individual glyphs are meaningful because they influence the patterns in the text.

The usage of t and k is indeed an interesting detail. k is rarely used in line initial position (k is used 129 out of 10934 times or 1% in line initial position, t 6%, p 24 %, f 8%). t on the other side is more common in line initial position. k is also rarely used in word initial position. (1166 word types did contain a k, but only 119 word types start with a k. This means that only 10 % of this word types start with k. t is used in 41% of the cases word initially, p in 70 % and f in 32,5 %).

With other words t and p are preferred in line and word initial position. Additionally p and f are preferred within the first line of a paragraph. And k is preferred within a paragraph, within a line and within a word. Therefore it is expected that words starting with qok- are more common then words starting with qot-.

The reason for this pattern is the shape of the glyphs. k and f need less space then t and p. The additional curve at the top is the reason that t is preferred over k at the beginning of a line or word. There is simply enough space since there is no other character in front to interfere with. 

The observation suggests that the glyphs are used differently because of their shape.