Seaby's age will count against him. Jolly had shown a bit, and was only 23. Wood was only 20 and had shown plenty for a 20 year old. Seaby has shown bits and pieces, but by 25 should have cemented his spot in his side, which he quite simply hasn't. When Jolly and Wood were drafted, they were drafted as potential stars. Seaby will never get to that point. The best he'll be is a solid second ruckman, and that would require an improvement from his current form. So yeah, there's no way he'll attract that sort of attention.
Based on his age, experience and the currency of ruckman under previous trades then Seaby is clearly an early second rounder (18 to 22).
We are on record as not going to trade our pick 6 or 23. so trading for Seaby by the Swans is very unlikely.
They may look at him as PSD target if it gets to that, but I don't see it happening with other clubs willing to trade for a ruckman this year or for next year.
DST