As seen recently

It shows that the man is old he can't fold his legs

Too big to fold the legs for his god.
His god must respect him too.

It proves Islam and its law are only for the poor. A poor man can never be allowed to do that. The same reason the Hisba and sharia police could do nothing against the daughter of Kano state Government during his daughter's marriage.
Come to think of it, if Buhari could shamelessly do this in public I wonder if he prays in secret.

Nothing is wrong with the picture because it is allowed

It is wrong for bihari to seat on a high chair while others sits on the floor.

The second is those people standing and backing the kabba