Yeah on balance you're right. The main thing holding me back is the mentality that Hore is a definite 'rookie' so it is easy to label him as a rookie and Darling as a 'keeper' so there a psychological aspect towards trading a 'keeper'. Also, there's the hope that Darling has 1 or 2 150+ monsters by season's end and FOMO will stop me trading him.
Heeney tonned up to get himself a reprieve for now, IMO.