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Hello @PhoenixRising ;
First, let me reiterate that normally, the up/down direction of the pick helps to keep your hand in sync with the timing of the music. However, I thought you asked about why Tony showed all down strokes.
There is a simple explanation. First, most guitarists never “learned” music theory. They could care less what theorists say about their music or how they analyze it. All down strokes gives a different sound and feel. Period. That’s it.
So, can you play down/up and copy any rhythm out there? Sorta. To a large extent, you can emulate a rhythm sound by doing it differently than the original player. But not always. Sometimes there is an unusual timing to the rhythm that happens because of the way the guitarist was moving his hand.
Bottom line, it’s up to you whether or not you wish to learn both styles or just stick to down/up.
MG 😀