The 47-year-old doubled his personal gold medal tally to four - equalling a record held by Allan Wells - after winning all 14 games he played during the Kelvingrove competitions.
The Tranent bowler, nicknamed Tattie, provided one of the most memorable Scottish moments of the Games when he celebrated his match-winning shot against England in the pairs semi-finals.
And Commonwealth Games Scotland have given him an even more momentous personal experience by naming him the flagbearer for Sunday night's Hampden celebration, when Scotland mark more than a half-century of medals.
Marshall said: "To win two gold medals in Scotland has been a dream come true for me. This is my fifth Commonwealth Games and it's the best ever for Scotland and me, and the icing on the cake came when I was told I was going to be carrying the flag in the closing ceremony and lead out 310 great Scottish athletes.
"It's a dream come true for myself. It'll be one of the biggest things in my career and I'm just so looking forward to it.
"This whole experience will stay with me for the rest of my life. There's been great banter in the village and everyday we're looking at the medal table and it's just going up and up.
"I think every sport was to try and get two medals which would have been 34 but we're now way beyond that and it's been a fantastic performance from everyone involved."
Team Scotland chef de mission Jon Doig added: "Alex is one of the most popular and respected sportsmen of his generation and his record in Lawn Bowls, is second to none.
"At these Games we have witnessed both his incredible skills and leadership on the greens, but also his passion to be out there representing Team Scotland here in Glasgow.
"He has been an inspiration to his fellow athletes, leading by example as the skip of both the medal-winning pairs and fours combinations.
"The athletes and management of Team Scotland will be proud to follow Alex into the closing ceremony to celebrate what has been our nation's most successful ever Commonwealth Games."