Normally it will be the player with the highest price in your transfer window. I don't know which level you are but I am lvl 32 for instance. Most players cost 110-111-112 mln. Some players cost 113 mln and those are normally your fast trainers. In the lower level you will sometimes see players that both cost 5 mln. One has a wage of 100.000 and the other has a wage of 50.000. The last one is propably a fast trainer compared to the higher salary. These are two ways I can tell what players are the faster trainers.

0 token offers are and will be an insult if you ask me. Good suggestions Nik in the other thread. The whole thing with negotions is that is unclear what the extra tokens mean at the start of the bidding. I hesitated a long time to put in a bid because it was unclear to me if I would loose the tokens if the bid was cancelled. It was also unclear if the bid would cost 9 tokens + the tokens you would bid. This has to be explained a lot better if you ask me.

So far I have had 2 good token offers for my players (with 5 and 6 tokens). All other bids were 0 token offers which they can shove somewhere. It just shows how flawed negotions are.