Funding cushion and expected increases in comp with 415

When computing the cushion amount for 404(o), you are allowed to include the amount by which the funding target would increase if future compensation increases were taken into account. Does this include the expected increase in the participant's 415 limit due to the increase in the high 3-year average compensation?

For example, say a participant's high 3-year average comp is $60,000/year(=$5,000/month) and their accrued benefit under the plan's formula before applying the 415 limit is $8,000/month. However the actuary reasonably expects the participant to earn $120,000/year for the next 3 years. Can increase in the funding target due to the extra $3,000 be included in the cushion?

Is the answer different depending on whether the plan is covered by PBGC? I know PBGC plans are permitted to assume increases in the 415 dollar limit for this purpose. I am not sure if that also applies to increases in 415 due to the 100% of pay limit.