Cubs' Vice-President John Holland and Manager Leo Durocher breathed a collective sigh of relief during the expansion draft last fall when Montreal plucked Bill Stoneman from the Chicago roster. The Expos' unexpected choice allowed the Cubs to protect three other young pitchers the front office considered more promising than Stoneman, a right-handed reliever with a 2-5 major league record. Last week, even with the Cubs off to their best start in 35 years, those sighs must have been replaced by raised eyebrows in the Chicago offices as Stoneman, now a starter, pitched the only no-hitter ever for a first-year expansion team. The little 5'10", 25-year-old reject's 7-0 win over Philadelphia was his first big league complete game and only the second of his pro career. And it came not as augury for another Year of the Pitcher but rather in spite of some startlingly improved hitting in both leagues. The majors' averages are up 18 points over the same time last season and teams are scoring 2.5 more runs a game. Stoneman, who threw only his fastball and curve, a pitch the Cubs would not let him use, was doubly overjoyed by his performance. It proved he could be an effective starter, and it had been done under the red, white and blue colors of Montreal. "I'm especially happy for the town," he said. "It was great to be drafted by this team, and I love playing for Montreal. Now the fans know we're not up here just to appear on the field. We're going to win some games." That is the kind of loyalty even hockey-loving Habitants can appreciate. At 2 a.m. a quorum welcomed their hero at the airport, chanting, "We want Stoneman." For a while, anyway, the Cubs might feel just that way, too.