Ah, I feel for Michael. A nice tribute puzzle, one with some subtlety and nuance, but without the punch it would have had at the 100th anniversary. It's unfortunate that a Sunday puzzle and then another one was published around that time, pushing Michael's nice construction back. Such is life. It had to be tough for Will, having already accepted this puzzle but then having a few nice Sunday submissions come in. Considering how much he (and other editors) typically need Sunday-size puzzles, it had to be a hard decision.
On to today's puzzle. As I mentioned before, I like the fact that Michael shot for something more than just a straight-up tribute puzzle. I wasn't totally familiar with COLLISION THEORY but what a nice answer. As a lover of all things chemistry, I really enjoyed reading up on this theory. Amazing to learn more about people who make breakthroughs in their fields of expertise. It's only too bad that Michael/Will had to use a straightforward, definitional clue for it. Totally understandable, because the entry is not well-known, but I really liked how they disguised TIP OF THE ICEBERG, for example.
I really enjoyed having the longer fill, OH BOTHER in particular. ECLIPSE is such a nice answer in itself, and the clever clue [Sun block?] makes it even better. It's amazing how just a small handful of great answers / great clues can really spice up a grid. Well worth the effort of 1.) incorporating a few long answers and 2.) spending time coming up with at least one killer clue.
Michael does a nice job with his layout and black square placement. Beautiful work in the NE and SW, big open corners with just an OMARS as a slight dent. Also, note the difficulty inherent in TITANIC SINKS being 12 letters. An "unfortunate length," this requires placement in row 12, not in row 13 as is often done. Might seem like a trifling issue, but this creates real difficulties in spacing. TIP OF THE ICEBERG and TITANIC SINKS are only a single row apart, and although Michael does well to save almost all the crossings, look at where ILE sits. The EDO/DEA/ATLI/ILE area is a bit unfortunate, all created by the ?T?I pattern which has few options, none of which are very good.
Finally, note how the NW and SE corners feel separated from the grid? That generally is frowned upon, because it's too easy to get stuck in a little area with no recourse. It's my fault as a solver for sticking with ANIMAL instinct for too long, but having only that one answer as an entryway into the section made it that much more difficult to solve. I think using that isolation is fine for this puzzle, since it allows Michael to incorporate ECLIPSE and OH BOTHER, but slightly easier clues in that NW (to offset the segregated nature) would have been much appreciated.
Well constructed, fun puzzle.