http://www.tfu.info/1992/Decepticon/Talon/talon.htm The toy's mold is different, but he's a Decepticon F-15 with many similarities in transformation- look at the nosecone and vents on the shoulders. The wings are in the same position, but have a reversed orientation. Could Talon be the rarely-seen green Seeker?
No, well, not really. A "Seeker" is a fan term describing a robot who shares the same base mould as Starscream. Incidently, that figure share's a coloursceme and head design with a larger jet-bot that would be later repainted into Starscream. But that's as close as it comes. I guess he's "related" to a seeker.
So nothing... ...or everything! And yet, that makes total sense. Hell, give him a subclass like Attack Seeker or Scout Seeker. It's totally up to you. To me, he's a Predator, seperate from Seekers, which are elite Decepticons who function in small, special forces-type units.
It's whatever you want it to be. If you want him to be the lost green seeker, then for you, he is. For me, there are only 6 seekers. Everyone else is just part of the DAF. Including a certain orange/yellow zealot.... In a lot of ways, that sums up the fandom too.