Don't take my word for it, but I've heard that if a barbel wont grow back you can prick it at the base a couple of times with a needle and that will get it going.
it got the de after jumping out...and most silvers get de anyway...so a 8 month old 22" silver with good colors and slight de is almost perfect...do you have silvers?...do they have de? and in my eyes it is perfect de or not....