+1 on this issue.
Don't think it's a bendix because the starter drive engages every time, it just does not have enough power to push though TDC. If you turn the key back, letting the compression pressure bleed down a touch, then turn the key back to crank mode, she will then fire.... seemingly every time. That being said, I take this as a warning, & since problems don't solve themselves & only get worse over time, I'm looking to correct this issue. I'm still on this fence as to weather this is a battery or starter issue.