The Glamorgan chief pointed to a lack of success on the field for the overhaul and claimed "the strategic changes would have been implemented" even if the Welsh county had gained promotion to Division One of the County Championship.
Glamorgan let slip a 37-point lead in County Championship Division Two and were held to their third draw in a row by Derbyshire in the final game of the season, allowing Worcestershire to pip them by five points to the second promotion spot.
Hamer went on to bemoan the lack of success in shorter forms of the game and to give the club's official explanation on the behind-the-scenes decisions that culminated in last week's upheaval.
At points, the letter rejects some of the explanations given by Maynard, Dalrymple and Walker as their reasons for resigning, and says the club regretted Maynard's and Walker's leaving and was disappointed that Dalrymple had chosen to go.
The letter also points to differences of opinion with Maynard over Dalrymple's future as captain and over the role that Australian batsman Mark Cosgrove might play.
The letter goes on to say that "funds are available to sign a player of the same pedigree" to replace Dalrymple on the playing staff, and that the club hoped that Cogrove - last season's player of the year - would accept the Twenty20 contract he had been offered.
Hamer also clarified the new role of head of coaching, saying that it is "not a replacement" for the first XI coach as "it is a strategic role and not a 'tracksuit'-based on the field coaching role".
However, the letter then states: "Colin [Metson] will be responsible for all cricketing matters and will spend equal amounts of time working with our emerging talent (via the Cricket Board of Wales) as he will with the first XI."
Glamorgan also confirmed: "The club is now committed to finding a world-class first XI coach, who will possess a demonstrable track record of success. The coach will report to the managing director of cricket."
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