Your two last messages raise a question to me. Now columns can only be formed straight ahead or turning 90? without being finished. I mean that we cannot make columns as per figure 4b in DBM.
Does a column formed in one only step pay one more PIP for being "a group other than a column wheeling"? It is not a column when the move begins, and the head element is wheeling as it is advancing up to its full move.
