I think the only way to see successful examples would be to find someone who is OK to provide those.
There’re caveats though:
- what has worked for one person will not necessarily work for another;
- what was a satisfactory piece of evidence a year (or even a month) ago will not necessarily still be satisfactory
The other thing is that if you feel uncomfortable with what kind of evidence you have for the Tech Nation it may indicate that your case is not strong enough.
I have my personal (entirely subjective) heuristic here: a candidate who is likely to be endorsed will usually have no issues altogether to secure Tier 2 visa as there’s a line of employers who are eager to get her/him on board. Similarly, such candidate knows exactly what kind of contribution to the industry she/he has done and telling a story and providing evidence for this is usually not a challenge.
Usual disclaimer: I don’t work for Tech Nation and neither I am representing Tech Nation