Sure. However discrediting someone is a common ploy to convince people that they are not to be trusted (in this case, more likely to have given the banned thymosin).
To me, the key here is the dosage regime. TA1 and thymomodulin have short half lives. They need to be given daily to have an effect. TB4 has a long half life and thus is given weekly (sometimes twice weekly) then monthly. If the players confessed to weekly or twice weekly injections, it couldn't have been TA1 or Thymomodulin. Basic pharmacology.
There is no point boosting the immune system for one day of the week!
Just to clarify AT, is this Roy Masters article wrong on the dosages? He has things reversed from what you are saying. Apologies if this has already been addressed elsewhere.
http://www.theage.com.au/afl/afl-ne...ests-on-injection-regime-20141027-11cgku.html
If ASADA's case though is as per Roy's article then that is describing TA1/Thymomodulin dosages and not TB4 dosages?