Woods has 5 starts and only one sack to his name. I'm not convinced that he will beat out TBC as a starter. He may emerge as a more than adequet starter, but I ain't sold on him yet. Obviously, Belichick isn't 100% either or he wouldn't have gone after Taylor in the first place.
As for Guyton, he had his moments, but he also had his share of bad moments. The guy has 34 tackles, 3 pass defenses, no sacks, and no INTs in 14 games last year. Great for an undrafted free agent rookie, but pretty mediocre for a guy who you expect to be your starter. He also could emerge, but I wouldn't consider him starting quality based on his 2008 season.