The phrase "a more definitive statement" is correct and usable in written English.
It can be used when you want to emphasize the need for clarity or certainty in a statement or argument.
Example: "In order to resolve the issue, we need a more definitive statement from the management regarding the new policy."
Alternatives: "a clearer statement" or "a more conclusive statement".
Note that JPMorgan used the word "may" rather than a more definitive statement that would suggest misconduct.
We used the computational hydrogen electrode method and neglected any proton-electron transfer reaction barriers in this work but including those will be necessary to make a more definitive statement, which is the subject of future work.
Gordon Brown claimed Labour had for some weeks been pressing for a more definitive statement about the timetable for the delivery of extra powers.
She also told Ms. Truman that she had warned her husband not to pardon Nixon, a more definitive statement than one she made in "The Times of My Life" (1978), the first volume of Mrs. Ford's autobiography.
"While the language on the ballot cites the hoped-for economic benefits, we feel obligated to ask for a more definitive statement as to how and where the money generated by these casinos will be spent," the bishops said.
The mayor had been expected to make a more definitive statement on whether he intended to seek a third term, but he opted to dodge the question, saying that he had "not had time to think about it".
Not until Thursday was he ready to concede that it "looks like the Russians were behind it," even as his own administration issued a much more definitive statement.
Mr. Bush, asked by a reporter today about that statement, said, "No, we've had no evidence that Saddam Hussein was involved with September the 11th," a far more definitive statement than the vice president's.
The more definitive statement about the tape clearly shows that the United States intelligence agencies, once divided over whether the Saudi exile had survived last year's war in Afghanistan, has now reached a consensus that he is still at large.
After just one week of Palm trees with coconuts hanging high and trees with real oranges hanging low, my dad made one more definitive statement.
A more balanced assessment of the science of extreme events and climate change, such as that found in the recent assessment of the Intergovernmental Panel on Climate Change, is less helpful politically than a science adviser willing to make more definitive statements.
