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The Seahawks have signed two tryout players from this past weekend's Rookie Mini-Camp: defensive end Benson Mayowa and TE Victor Marshall. They released former Miami LB Ramon Buchanan, whom had been signed as a UDFA on the third day of the Draft.
Benson Mayowa caught Pete Carroll's eye during the three-day tryout because of his speed off the edge, and apparently did enough on the practice field to warrant a further look. The 6'2, 241 pound DE out of Idaho was a participant in the Dallas Super Regional Combine on April 2nd (meaning, he impressed enough at his first regional combine to be selected for another look where more teams and scouts would attend) and in Dallas, he ran a 4.73 40 with a 1.64 10-yard split, registered a 37.5" vertical and a 10'0" broad jump. He ran the 3-cone in 7.05 seconds and the short shuttle in 4.26 seconds. The long-speed 40 is lacking a bit for what Seattle typically wants in a LEO end, but his vert, 3-cone, and short shuttle tests all show explosiveness so I'm guessing this is the more important factor (not often will you see a defensive end running 40 yards).
As Jared Stanger pointed out on Twitter, Mayowa averaged 20 tackles, 3 sacks and 3 forced fumbles per year over his 3-year career at Idaho.
As for Marshall: the Seahawks' theme at TE this week has obviously been speed - Pete Carroll raved about Luke Willson's performance over the three-day mini-camp, and that's apparently something Marshall brings to the table as well. The University of British Columbia product stands 6'4, 235 pounds and as John Boyle points out, as a prep at local Juanita High School, he finished 2nd in the 100 and 200 meter events as a senior. This means - he's fast as shit. Or he was, anyway. I'm guessing he still is and that's a big reason the Seahawks liked him. I'd tell you what he did at his pro day but there doesn't appear to be anything on the internet about this guy. Or at least on the first page of Google search results, which is as far as I got before asking John Boyle about him on Twitter (better than Google). Boyle says that one site notes Marshall ran a 4.6 at a 2012 regional combine but that's unconfirmed. My guess is that he's fast. That's my point.