Villa look just about safe at this stage in the season.
"Only time will tell whether the decision not to buy in January was brave or foolhardy," said Gregory.
"But standing by Paul was the right thing to do to because the signs are there.
"It was a big shock that Reading parted with their manager at such a strange time. Had it been January you could understand it because the new guy would have a chance to bring in one or two signings.
"Now Reading can only play the same players until the end of the season."