SAN DIEGO — Nothing much happens in the ninth inning of a 16-3 blowout victory. The Giants were on the winning end of one Wednesday while completing a homestand against the Milwaukee Brewers.But even while wrapping up one of their best wins of the season, they put their strategic shortcomings on display.The Brewers had first baseman Andrew Vaughn lob pitches in the bottom of the eighth inning. The Giants had several position player candidates who could’ve done the same in the top of the ninth. Instead, they brought in right-hander Keaton Winn.The same Keaton Winn who had thrown the previous night. The same Keaton Winn who landed on the injured list earlier in the year when his elbow flared up due to overuse. It’s not as if the Giants had a travel day coming up, either. They were beginning a series in San Diego the following night. Using Winn to finish a 13-run game ensured that he wouldn’t be available the following day.There was no harm done in Winn’s appearance — he got three outs on 14 pitches, although one of them drilled Vaughn off the helmet — but it was an absolute waste of pitching resources.The misuse of resources and odd usage decisions have been happening all year under manager Tony Vitello’s pitching group, headed up by Justin Meccage and Frank Anderson. The Giants have stuck to a conventional approach when they simply haven’t been deep or talented enough to play it straight up. They haven’t used openers or looked to exploit matchups. Their tendencies became obvious by the end of April when they decided against using their extra player (Trevor McDonald) as part of a bullpen game to get through the back end of a doubleheader at Philadelphia. Instead, they started Adrian Houser, ensuring that they would need a spot starter five days later.The Giants were walked off in both ends of that doubleheader at Philly, something that hadn’t happened to them since 1956. You could argue that the team never really recovered from that twin killing.As a result, Giants president Buster Posey finds himself in sell mode at the trade deadline. The team made their first move following Sunday’s 5-4 loss to the San Diego Padres at Petco Park, trading right-hander Tyler Mahle to the Atlanta Braves for right-handed reliever Anthony Molina. By the time the clock strikes 3 p.m. PDT on Monday, they’re expected to offload left-hander Robbie Ray and All-Star second baseman Luis Arraez as well.From an emotional standpoint, Arraez’s loss will be felt the greatest. He’s been one of the few entertaining and inspiring players in a Giants uniform this season, and with both Casey Schmitt and Jesus Rodriguez on the IL, the Giants aren’t exactly flush with upside plays who merit the investment of innings and plate appearances at second base over the final two months.From a practical standpoint, though, it’ll be trickier for the Giants to backfill two-fifths of their starting rotation. They have their ace, Logan Webb, and they have right-hander Landen Roupp, who has exceeded his career high for innings and was undone once again by deep counts and walks while giving up five runs in 4 2/3 innings on Sunday.After that, it gets dicier. McDonald isn’t an option. He is out for the season, and likely all of next year, as he readies himself for Tommy John elbow reconstruction surgery. Houser, if he isn’t traded, is under contract for next season and probably headed back to the starting role that he greatly prefers. Carson Whisenhunt will continue to get starts by default even if his best chance to stick in the big leagues is probably in relief. It’s probably time for the Giants to see what they’ve got with Matt “Tugboat” Wilkinson, the left-hander who was acquired from the Cleveland Guardians for catcher Patrick Bailey in May.