I do not know very much about all this courses that been shared here by the op, but I in particular have always turned to udemy for any course at all, whether crypto related or not.
Though the course on udemy aren't free, and there are actually ones that are or may appear pretty expensive for some people, but the fact is that there are still cheap ones, and they are always worth their prices - this is based on the once I've brought and studied though.
And as for Micheal saylor's work, or crypto educational materials, I've never gone through or studied any of his materials, though I am very familiar with his name, so, I honestly can not judge him for which ever way he teaches, I possibly do believe he does teach the best way his talent leads him to.