"The proposed merger changes Metlifecare's risk profile and shareholders need to be appropriately compensated for the changes," he said.
"Metlifecare's deal to expand into a much larger business was hobbled by unhappy shareholders who sought a change to the terms so those involved get less money."
A fortnight ago, Metlifecare said a $216 million deal would be completed in the next few weeks subject to a meeting and shareholder vote, where Retirement Villages would be excluded.
Under the new terms, Metlifecare will still buy Vision Senior Living, which is 68 per cent owned by Goldman Sachs, and Private Life Care, owned by Retirement Villages Group, which has 50.1 per cent of Metlifecare.
But instead of getting 21 million Metlifecare shares, Vision will get 13 million and instead of 30.5 million, Private will get 29.7 million.
Both vendors will also have to keep those Metlifecare shares in escrow for 16 months after settlement.
Metlifecare also released more information and clarification on the forecast increase in the group operating cash flow next year.
Craig Tyson of OnePath, with 9.1 per cent, said the changes addressed some of the issues his organisation had with the original proposal.
"In particular we believed that the original deal metrics failed to reflect that Metlifecare's portfolio was better quality and had lower gearing than either Vision or Private," Tyson said.
"As a Metlifecare investor, we are also encouraged by the fact that there is value at risk for Vision if the merger does not result in a 50 per cent rerating in Metlifecare's share price over a 28-month period post the deal."
Lengthening the escrow period and increasing the level of financial disclosure to allow Metlifecare investors to better gauge the terms was also good but support was not guaranteed.
"We will be dissecting the new proposal and the independent report before deciding whether to support the new proposal," Tyson said.