The DA has no requirements for experience or snap count. Only rule is they have to sub in for another American. The Bombers haven't been using the nationalized player rule since Grant has been out. The DA is what was formerly called the Designated Import.
They haven't used Jackson on offense more than 10 snaps a game when he's dressed and they have 7 OL dressed.
They have Augustine who should be able to function as a second back to throw a block, line up off the tackle and come across to throw a split block on an end backside, arc block backside. They bring in Demski or Bailey or Wolitarsky often when they go max protect. To me they want Jackson on the roster more for special teams reasons and it's an incredible luxury. Somewhat unreasonable given how thin the DL is on the roster particularly with Jeffcoat's ongoing injury issues.
Defensive players should be going full speed from snap to whistle every play. You need way more subs there than on offense where you're really subbing guys to give different looks more than anything else. Running backs might need a break, receivers if they have a big play or take a hit, but for the most part guys like Schoen, Lawler might leave the field for 3-4 snaps in a whole game.
Balls kicked off a tee have way less spin than a ball kicked off a drop, especially as the punters have worked on developing that, something that comes natural to the guys who are rugby/Aussie Rules players. Ball kicked off a tee is tumbling end over end, a ball kicked of a drop could be spinning a variety of ways and they all break differently. They have to decide where and when to catch it, have some eyes on the coverage but mostly on the ball. Spiral punts (basically what anyone would do if you tossed them a ball and told them to punt it, assuming they hit it square, hold ball vertical) a lot of guys can catch on the run, but you see from watching McCrae and Parker the past few games they haven't caught any on the run, think Parker maybe did once but also let the ball hit the turf a bunch of times. A lot of the punters now are doing drop punts which is straight out of rugby. They rotate the opposite of the spiral punt and is what the NFL wants for those kicks to pin teams inside the 10 because it should hit the turf and bounce back into the field, not into the endzone. Punter will hold the ball horizontal and basically drop it down to their toe.
A lot of the issues with catching the ball in general is what you see with punts. Need to catch with hands, secure in arms, not let it get into shoulder pads that's when you see the bobble. Need to track the ball and look it in, obviously not easy when you're going to get cranked.