SAN FRANCISCO — San Francisco Giants amateur scouting director Michael Holmes and his staff are confident the organization will select an impact player with the fourth pick in the MLB Draft on Saturday.If any of the three players whom most mock drafts project to go at the top are still available with the fourth pick, it’s hard to imagine the Giants would let UCLA shortstop Roch Cholowsky, Texas high school shortstop Grady Emerson or Georgia Tech catcher Vahn Lackey slide any further. And if all three are off the board? Plenty of talented options remain.The Giants could select Miami-area high school shortstop Jacob Lombard. Or Mississippi high school outfielder Eric Booth Jr. Or Georgia Tech outfielder Drew Burress. When Baseball America released its final mock draft Wednesday, the publication flipped its projection for the No. 4 pick from Lombard to Booth Jr.Then there’s the consensus top pitcher in this class, UC Santa Barbara right-hander Jackson Flora, who would appear to be a fit in so many respects. Flora stands an imposing 6 feet 5 and has all the equipment to pitch at the front of a rotation. He’s a college junior who could move quickly through the minor leagues. He’s also a Bay Area native who starred at Foothill High in Pleasanton, Calif. — the same high school that produced former Giants shortstop Brandon Crawford.The latest MLB draft intelKeith LawAnd if you haven’t noticed, the Giants are in dire need of pitching at the major-league level. They’re also tilted heavily toward position players in an otherwise improving farm system.Given the context, it might be difficult to imagine how the Giants could take anyone other than Flora.That’s not how the draft works, though.“At some point, we know we want to get some pitching, especially some starting pitching, and there may come a point in the draft where that becomes a little focused,” Holmes said in a dugout interview before Wednesday’s 10-0 loss to the Toronto Blue Jays at Oracle Park. “I just think up higher, we have to continue to think about taking the best available (player).”Isn’t that what every amateur scouting director says this time of year?“Yeah,” Holmes said with a chuckle. “And you’re going to keep hearing it.”There’s a reason for that. With rare exceptions, the MLB Draft is not a plug-and-play exercise. No draft pick is guaranteed to reach the major leagues. Many top picks end up benefiting their first organization as a trade chip who brings back talent in another form. Drafting for need over value is asking for trouble.Here’s the truth: Drafting for need isn’t Holmes’ job. It shouldn’t fall on him and his staff to provide an immediate remedy for a pitching deficit that has exposed three layers of organizational failure.The Giants get an F for overestimating the strength of the pitching within their system to begin the season. They get an F for being unable to develop those arms under their third wave of pitching coaches in four years. And in retrospect, those twin shortcomings make it even more galling that ownership gets an F for not providing the resources that would have allowed Buster Posey’s front office to invest more heavily in the free-agent pitching market in the winter.A team that did invest? The Blue Jays. They signed right-hander Dylan Cease to a seven-year, $210 million contract. They signed former Giants reliever Tyler Rogers to a three-year, $37 million deal. Cease has a 2.56 ERA in 17 starts and leads the American League in strikeouts. Rogers has a 1.73 ERA and hasn’t allowed a home run in his 43 appearances. Either of those pitchers could have made a major impact on a Giants staff that ranks No. 27 out of 30 clubs with minus-4.8 WAR.To that point, while capturing a road series Wednesday, the Blue Jays fluttered out of town on a dovetail. Cease came within three outs of becoming the first pitcher to no-hit the Giants in the 27-year history of their waterfront ballpark at 24 Willie Mays Plaza.