The Broncos’ ownership search will reach a critical stage Monday afternoon when four groups are expected to submit second-round bids to purchase the franchise, a source confirmed. Over the past month, representatives from the groups have traveled to the Denver area to meet with Broncos executives and tour the team’s facility and Empower Field at Mile High. Forbes reported this morning that bankers believe Rob Walton will have the winning bid of $4.5 billion although that is complete speculation/projection since the bids have not been submitted yet. A source said in early May that once the second round of proposals are submitted, it is possible a new owner would be selected or two groups would advance to a next round. It remains certain the Broncos’ eventual sale price will be a record for an American pro sports franchise. The Broncos, on sale for the first time since Pat Bowlen bought the team in 1984, are expected to command at least $4 billion and potentially $4.5 billion.