Great insight! While I was hoping Water's Legendary summoner would get a +1 Melee boost, I can see from your example above why that isn't likely to happen. Perhaps if River hadn't have rececived Inspire it would have been possible, but it seems like it would be too OP if they did that now. I do like your conjecture on the ranged focus and I think you have put together a pretty compelling 3 abilities that could make a ranged Legendary summoner quite valuable. Close range and Shatter help reduce ranged monsters' main weaknesses. I would definitely be interested in a Water Legendary summoner with those 2 abilities along with +1 ranged damage! (crossing fingers)
RE: Speculation on Legendary Water Summoner based on Modern League